ZSI_Reconnect_China/PATSTAT/CPC_data/CPCSchemeXML202302/cpc-scheme-H01S.xml

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<class-scheme publication-date="2023-02-01" scheme-type="cpc" publication-type="official">
<classification-item breakdown-code="false" not-allocatable="true" level="5" additional-only="false" sort-key="H01S" definition-exists="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT</text></title-part><title-part><text>DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> This subclass <u>covers</u>: <subnote type="alpha"><note-paragraph>devices using the stimulated emission of radiation by excited atoms or molecules to amplify or generate coherent monochromatic electromagnetic radiation;</note-paragraph><note-paragraph>functions as modulating, demodulating, controlling or stabilising such coherent monochromatic electromagnetic radiation.</note-paragraph></subnote></note-paragraph></note><note type="warning"><note-paragraph>In this subclass non-limiting references (in the sense of paragraph 39 of the Guide to the IPC) may still be displayed in the scheme.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="true" level="6" additional-only="false" sort-key="H01S1/00" date-revised="2013-01-01" status="published"><classification-symbol>H01S1/00</classification-symbol>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H01S1/00" definition-exists="true" ipc-concordant="H01S1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S1/00</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Masers, i.e. devices using stimulated emission of electromagnetic radiation in the microwave range</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S1/005" definition-exists="false" ipc-concordant="H01S1/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S1/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a relativistic beam of charged particles, e.g. electron cyclotron maser, gyrotron</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S1/02" definition-exists="false" ipc-concordant="H01S1/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S1/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>solid</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S1/04" definition-exists="false" ipc-concordant="H01S1/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S1/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>liquid</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S1/06" definition-exists="true" ipc-concordant="H01S1/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S1/06</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Gaseous </text><CPC-specific-text><text>, i.e. beam masers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H01S3/00" definition-exists="true" ipc-concordant="H01S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S3/00</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range </text><reference><text>semiconductors lasers <class-ref scheme="cpc">H01S5/00</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S3/0007" definition-exists="false" ipc-concordant="H01S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H01S3/0007</classification-symbol><class-title date-revised="2016-05-01"><title-part><CPC-specific-text><text>Applications not otherwise provided for </text><reference><text>working metals or other materials by laser beam <class-ref scheme="cpc">B23K26/00</class-ref>; using photons to produce a reactive propulsive thrust <class-ref scheme="cpc">F03H3/00</class-ref>; optical recording of measured values in general <class-ref scheme="cpc">G01D15/14</class-ref>; optics in general <class-ref scheme="cpc">G02B</class-ref>; holographic processes or apparatus <class-ref scheme="cpc">G03H</class-ref>; optical marking or sensing of data record carriers <class-ref scheme="cpc">G06K7/10</class-ref>&#160;-&#160;<class-ref scheme="cpc">G06K7/14</class-ref>, <class-ref scheme="cpc">G06K15/12</class-ref>; injection heating of plasma by laser <class-ref scheme="cpc">H05H1/22</class-ref>; acceleration of neutral particles by electromagnetic wave pressure <class-ref scheme="cpc">H05H3/04</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S3/0014" definition-exists="false" ipc-concordant="H01S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0014</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Monitoring arrangements not otherwise provided for </text><reference><text>photometry <class-ref scheme="cpc">G01J1/00</class-ref>, e.g. <class-ref scheme="cpc">G01J1/4257</class-ref>; radiation pyrometry <class-ref scheme="cpc">G01J5/00</class-ref>; measuring coherence of light <class-ref scheme="cpc">G01J9/00</class-ref>; measuring wavelength of light <class-ref scheme="cpc">G01J9/00</class-ref>, e.g. <class-ref scheme="cpc">G01J9/0246</class-ref>; measuring optical pulses <class-ref scheme="cpc">G01J11/00</class-ref>; calorimetrically measuring power of laser beams <class-ref scheme="cpc">G01K17/003</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S3/005" definition-exists="false" ipc-concordant="H01S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/005</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping </text><reference><text>shaping laser beam for working metal or other materials <class-ref scheme="cpc">B23K26/06</class-ref>; optical elements, systems or apparatus in general <class-ref scheme="cpc">G02B</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/0057" definition-exists="false" ipc-concordant="H01S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0057</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Temporal shaping, e.g. pulse compression, frequency chirping </text><reference><text>soliton generation and propagation <class-ref scheme="cpc">G02F1/3513</class-ref>, <class-ref scheme="cpc">H01S3/063</class-ref> and <class-ref scheme="cpc">H01S3/108</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/0064" definition-exists="false" ipc-concordant="H01S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-08-01" status="published"><classification-symbol>H01S3/0064</classification-symbol><class-title date-revised="2018-08-01"><title-part><CPC-specific-text><text>Anti-reflection devices, e.g. optical isolaters </text><reference><text>absorbing layers for marking or protecting purposes in laser working <class-ref scheme="cpc">B23K26/50</class-ref>; magneto-optical non-reciprocal devices <class-ref scheme="cpc">G02F1/093</class-ref>, <class-ref scheme="cpc">G02F1/0955</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/0071" definition-exists="false" ipc-concordant="H01S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0071</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Beam steering, e.g. whereby a mirror outside the cavity is present to change the beam direction</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/0078" definition-exists="false" ipc-concordant="H01S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0078</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Frequency filtering</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/0085" definition-exists="false" ipc-concordant="H01S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0085</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Modulating the output, i.e. the laser beam is modulated outside the laser cavity</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/0092" definition-exists="false" ipc-concordant="H01S3/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0092</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity </text><reference><text>nonlinear frequency conversion <u>per se</u> <class-ref scheme="cpc">G02F1/35</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S3/02" definition-exists="true" ipc-concordant="H01S3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Constructional details </text><CPC-specific-text><reference><text>housings or packages of fibre lasers <class-ref scheme="cpc">H01S3/06704</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/022" definition-exists="false" ipc-concordant="H01S3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/022</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of liquid lasers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/025" definition-exists="false" ipc-concordant="H01S3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of solid state lasers, e.g. housings or mountings</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/027" definition-exists="false" ipc-concordant="H01S3/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/027</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising a special atmosphere inside the housing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/03" definition-exists="true" ipc-concordant="H01S3/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S3/03</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>of gas laser discharge tubes</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0305" definition-exists="false" ipc-concordant="H01S3/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0305</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Selection of materials for the tube or the coatings thereon</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/031" definition-exists="false" ipc-concordant="H01S3/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/031</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Metal vapour lasers, e.g. metal vapour generation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0315" definition-exists="false" ipc-concordant="H01S3/03" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0315</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Waveguide lasers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/032" definition-exists="false" ipc-concordant="H01S3/032" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/032</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for confinement of the discharge, e.g. by special features of the discharge constricting tube</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0323" definition-exists="false" ipc-concordant="H01S3/032" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0323</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by special features of the discharge constricting tube, e.g. capillary</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0326" definition-exists="false" ipc-concordant="H01S3/032" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0326</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by an electromagnetic field</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/034" definition-exists="true" ipc-concordant="H01S3/034" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S3/034</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Optical devices within, or forming part of, the tube, e.g. windows, mirrors </text><reference><text>reflectors having variable properties or positions for initial adjustment of the resonator <class-ref scheme="cpc">H01S3/086</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0343" definition-exists="false" ipc-concordant="H01S3/034" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0343</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Aerodynamic windows</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0346" definition-exists="false" ipc-concordant="H01S3/034" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0346</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Protection of windows or mirrors against deleterious effects </text><reference><text>cooling arrangements <class-ref scheme="cpc">H01S3/0401</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/036" definition-exists="true" ipc-concordant="H01S3/036" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S3/036</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Means for obtaining or maintaining the desired gas pressure within the tube, e.g. by gettering, replenishing</text></title-part><title-part><text>Means for circulating the gas, e.g. for equalising the pressure within the tube </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H01S3/031</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/038" definition-exists="false" ipc-concordant="H01S3/038" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/038</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Electrodes, e.g. special shape, configuration or composition</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0381" definition-exists="false" ipc-concordant="H01S3/038" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0381</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Anodes or particular adaptations thereof</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0382" definition-exists="false" ipc-concordant="H01S3/038" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0382</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cathodes or particular adaptations thereof</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0384" definition-exists="false" ipc-concordant="H01S3/038" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0384</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Auxiliary electrodes, e.g. for pre-ionisation or triggering, or particular adaptations therefor</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0385" definition-exists="false" ipc-concordant="H01S3/038" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0385</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Shape</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0387" definition-exists="false" ipc-concordant="H01S3/038" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0387</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Helical shape</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0388" definition-exists="false" ipc-concordant="H01S3/038" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0388</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Compositions, materials or coatings</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/04" definition-exists="false" ipc-concordant="H01S3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S3/04</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Arrangements for thermal management</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0401" definition-exists="false" ipc-concordant="H01S3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0401</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of optical elements being part of laser resonator, e.g. windows, mirrors, lenses</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0402" definition-exists="false" ipc-concordant="H01S3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0402</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for liquid lasers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0404" definition-exists="false" ipc-concordant="H01S3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0404</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Air- or gas cooling, e.g. by dry nitrogen</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0405" definition-exists="false" ipc-concordant="H01S3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0405</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Conductive cooling, e.g. by heat sinks or thermo-electric elements</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0407" definition-exists="false" ipc-concordant="H01S3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0407</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Liquid cooling, e.g. by water</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0408" definition-exists="false" ipc-concordant="H01S3/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0408</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Radiative cooling, e.g. by anti-Stokes scattering in the active medium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/041" definition-exists="false" ipc-concordant="H01S3/041" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/041</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for gas lasers </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H01S3/0401</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/042" definition-exists="false" ipc-concordant="H01S3/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/042</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for solid state lasers </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H01S3/0401</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S3/05" definition-exists="false" ipc-concordant="H01S3/05" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-05-01" status="published"><classification-symbol>H01S3/05</classification-symbol><class-title date-revised="2017-05-01"><title-part><text>Construction or shape of optical resonators</text></title-part><title-part><text>Accommodation of active medium therein</text></title-part><title-part><text>Shape of active medium</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/06" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Construction or shape of active medium</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0602" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0602</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Crystal lasers or glass lasers </text><reference><text><class-ref scheme="cpc">H01S3/063</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0604" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0604</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in the form of a plate or disc</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0606" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0606</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with polygonal cross-section, e.g. slab, prism </text><reference><text><class-ref scheme="cpc">H01S3/0604</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0608" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0608</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Laser crystal with a hole, e.g. a hole or bore for housing a flashlamp or a mirror</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/061" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/061</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with elliptical or circular cross-section and elongated shape, e.g. rod</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0612" definition-exists="true" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0612</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Non-homogeneous structure </text><reference><text><class-ref scheme="cpc">H01S3/07</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0615" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0615</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Shape of end-face</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0617" definition-exists="true" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0617</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having a varying composition or cross-section in a specific direction</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0619" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0619</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coatings, e.g. AR, HR, passivation layer</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0621" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0621</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coatings on the end-faces, e.g. input/output surfaces of the laser light</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0623" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0623</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Antireflective [AR]</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0625" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0625</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coatings on surfaces other than the end-faces</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0627" definition-exists="false" ipc-concordant="H01S3/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0627</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the resonator being monolithic, e.g. microlaser</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/063" definition-exists="false" ipc-concordant="H01S3/063" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/063</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Waveguide lasers, </text><CPC-specific-text><text>i.e. whereby the dimensions of the waveguide are of the order of the light wavelength </text><reference><text>waveguide gas lasers <class-ref scheme="cpc">H01S3/0315</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0632" definition-exists="false" ipc-concordant="H01S3/063" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0632</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Thin film lasers in which light propagates in the plane of the thin film</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0635" definition-exists="false" ipc-concordant="H01S3/063" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0635</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>provided with a periodic structure, e.g. using distributed feed-back, grating couplers </text><reference><text>controlling, e.g. modulating distributed feed-back lasers <class-ref scheme="cpc">H01S3/102</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0637" definition-exists="false" ipc-concordant="H01S3/063" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0637</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Integrated lateral waveguide, e.g. the active waveguide is integrated on a substrate made by Si on insulator technology (Si/SiO<sub>2</sub>)</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/067" definition-exists="true" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S3/067</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Fibre lasers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/06704" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06704</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Housings; Packages</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/06708" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06708</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Constructional details of the fibre, e.g. compositions, cross-section, shape or tapering </text><reference><text>optical fibres as passive waveguides <class-ref scheme="cpc">G02B6/02</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/06712" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06712</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Polarising fibre; Polariser</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/06716" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06716</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fibre compositions </text><reference><text><u>per se</u> <class-ref scheme="cpc">C03C13/04</class-ref></text></reference><text>or doping with active elements </text><reference><text>lasing materials in general <class-ref scheme="cpc">H01S3/14</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/0672" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0672</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Non-uniform radial doping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/06725" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06725</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fibre characterized by a specific dispersion, e.g. for pulse shaping in soliton lasers or for dispersion compensating [DCF]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/06729" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06729</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Peculiar transverse fibre profile</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H01S3/06733" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06733</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fibre having more than one cladding</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H01S3/06737" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06737</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fibre having multiple non-coaxial cores, e.g. multiple active cores or separate cores for pump and gain</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H01S3/06741" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06741</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Photonic crystal fibre, i.e. the fibre having a photonic bandgap</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/06745" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06745</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tapering of the fibre, core or active region</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0675" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0675</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Resonators including a grating structure, e.g. distributed Bragg reflectors [DBR] or distributed feedback [DFB] fibre lasers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/06754" definition-exists="true" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06754</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fibre amplifiers </text><reference><text><class-ref scheme="cpc">H01S3/06708</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/06758" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06758</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tandem amplifiers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/06762" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06762</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having a specific amplification band</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H01S3/06766" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06766</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>C-band amplifiers, i.e. amplification in the range of about 1530 nm to 1560 nm</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H01S3/0677" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0677</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>L-band amplifiers, i.e. amplification in the range of about 1560 nm to 1610 nm</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H01S3/06775" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06775</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>S-band amplifiers, i.e. amplification in the range of about 1450 nm to 1530 nm</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/06779" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06779</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with optical power limiting</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/06783" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06783</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Amplifying coupler</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/06787" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06787</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bidirectional amplifier</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/06791" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06791</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fibre ring lasers </text><reference><text>fibre laser gyrometers <class-ref scheme="cpc">G01C19/72</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/06795" definition-exists="false" ipc-concordant="H01S3/067" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/06795</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with superfluorescent emission, e.g. amplified spontaneous emission sources for fibre laser gyrometers </text><reference><text>fibre laser gyrometers <u>per se</u> <class-ref scheme="cpc">G01C19/72</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/07" definition-exists="true" ipc-concordant="H01S3/07" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/07</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>consisting of a plurality of parts, e.g. segments </text><reference><text><class-ref scheme="cpc">H01S3/067</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/073" definition-exists="false" ipc-concordant="H01S3/07" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/073</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Gas lasers comprising separate discharge sections in one cavity, e.g. hybrid lasers </text><reference><text>tandem arrangements of separate gas lasers <class-ref scheme="cpc">H01S3/2366</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/076" definition-exists="false" ipc-concordant="H01S3/07" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/076</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Folded-path lasers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/08" definition-exists="true" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/08</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Construction or shape of optical resonators or components thereof</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/08004" definition-exists="false" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/08004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>incorporating a dispersive element, e.g. a prism for wavelength selection </text><reference><text><class-ref scheme="cpc">H01S3/0811</class-ref>, <class-ref scheme="cpc">H01S3/08022</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/08009" definition-exists="false" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/08009</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a diffraction grating</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/08013" definition-exists="false" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-09-01" status="published"><classification-symbol>H01S3/08013</classification-symbol><class-title date-revised="2015-09-01"><title-part><CPC-specific-text><text>Resonator comprising a fibre, e.g. for modifying dispersion or repetition rate </text><reference><text>the active medium being a fibre <class-ref scheme="cpc">H01S3/067</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/08018" definition-exists="false" ipc-concordant="H01S3/08018" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/08018</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Mode suppression</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/08022" definition-exists="true" ipc-concordant="H01S3/08022" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/08022</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Longitudinal modes </text><reference><text>mode suppression using a plurality of resonators <class-ref scheme="cpc">H01S3/082</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/08027" definition-exists="false" ipc-concordant="H01S3/08022" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/08027</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by a filter, e.g. a Fabry-Perot filter is used for wavelength setting</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/08031" definition-exists="false" ipc-concordant="H01S3/08031" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/08031</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Single-mode emission</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/08036" definition-exists="false" ipc-concordant="H01S3/08036" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/08036</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>using intracavity dispersive, polarising or birefringent elements</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0804" definition-exists="false" ipc-concordant="H01S3/0804" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/0804</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Transverse or lateral modes</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/08045" definition-exists="false" ipc-concordant="H01S3/08045" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/08045</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Single-mode emission</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0805" definition-exists="false" ipc-concordant="H01S3/0805" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/0805</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>by apertures, e.g. pin-holes or knife-edges</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/08054" definition-exists="false" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/08054</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Passive cavity elements acting on the polarization, e.g. a polarizer for branching or walk-off compensation </text><reference><text>quarter-wave plates in a Q-switch laser <class-ref scheme="cpc">H01S3/1124</class-ref>, <class-ref scheme="cpc">H01S3/115</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/08059" definition-exists="false" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/08059</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Constructional details of the reflector, e.g. shape </text><reference><text>mirrors in general <class-ref scheme="cpc">G02B5/08</class-ref>; mountings for mirrors <class-ref scheme="cpc">G02B7/18</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/08063" definition-exists="false" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/08063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Graded reflectivity, e.g. variable reflectivity mirror</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/08068" definition-exists="false" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/08068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Holes; Stepped surface; Special cross-section</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/08072" definition-exists="false" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/08072</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Thermal lensing or thermally induced birefringence; Compensation thereof</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/08077" definition-exists="false" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/08077</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pump induced waveguiding, i.e. the pump induces refractive index change in the laser medium to guide the amplified light, e.g. gain- or loss- guiding or thermally induced refractive index change</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/08081" definition-exists="false" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/08081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Unstable resonators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/08086" definition-exists="true" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/08086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Multiple-wavelength emission</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0809" definition-exists="false" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0809</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Two-wavelenghth emission</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/08095" definition-exists="true" ipc-concordant="H01S3/08" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/08095</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Zig-zag travelling beam through the active medium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/081" definition-exists="true" ipc-concordant="H01S3/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/081</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>comprising three or more reflectors</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0811" definition-exists="false" ipc-concordant="H01S3/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0811</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>incorporating a dispersive element, e.g. a prism for wavelength selection</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0812" definition-exists="false" ipc-concordant="H01S3/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0812</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a diffraction grating</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0813" definition-exists="false" ipc-concordant="H01S3/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0813</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Configuration of resonator</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0815" definition-exists="false" ipc-concordant="H01S3/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H01S3/0815</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>having 3 reflectors, e.g. V-shaped resonators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0816" definition-exists="false" ipc-concordant="H01S3/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H01S3/0816</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>having 4 reflectors, e.g. Z-shaped resonators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0817" definition-exists="false" ipc-concordant="H01S3/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H01S3/0817</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>having 5 reflectors, e.g. W-shaped resonators</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0818" definition-exists="false" ipc-concordant="H01S3/081" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0818</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Unstable resonators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/082" definition-exists="true" ipc-concordant="H01S3/082" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/082</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>defining a plurality of resonators, e.g. for mode selection or suppression</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0823" definition-exists="false" ipc-concordant="H01S3/082" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0823</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>incorporating a dispersive element, e.g. a prism for wavelength selection</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/0826" definition-exists="false" ipc-concordant="H01S3/082" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0826</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a diffraction grating</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/083" definition-exists="true" ipc-concordant="H01S3/083" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S3/083</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Ring lasers </text><CPC-specific-text><reference><text>fibre ring lasers <class-ref scheme="cpc">H01S3/06791</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/0835" definition-exists="false" ipc-concordant="H01S3/083" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0835</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Gas ring lasers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/086" definition-exists="true" ipc-concordant="H01S3/086" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/086</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>One or more reflectors having variable properties or positions for initial adjustment of the resonator </text><reference><text>varying a parameter of the laser output during operation <class-ref scheme="cpc">H01S3/10</class-ref>; stabilisation of the laser output <class-ref scheme="cpc">H01S3/13</class-ref></text></reference></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S3/09" definition-exists="false" ipc-concordant="H01S3/09" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/09</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Processes or apparatus for excitation, e.g. pumping</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/0903" definition-exists="false" ipc-concordant="H01S3/09" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0903</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Free-electron laser</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/0906" definition-exists="false" ipc-concordant="H01S3/09" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0906</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Electrical, electrochemical, or electron-beam pumping of a dye laser</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/091" definition-exists="false" ipc-concordant="H01S3/091" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/091</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using optical pumping</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0912" definition-exists="false" ipc-concordant="H01S3/091" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0912</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Electronics or drivers for the pump source, i.e. details of drivers or circuitry specific for laser pumping </text><reference><text>laser diode drivers <class-ref scheme="cpc">H01S5/042</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0915" definition-exists="false" ipc-concordant="H01S3/0915" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0915</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by incoherent light</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/09155" definition-exists="false" ipc-concordant="H01S3/0915" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/09155</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by cathodo-luminescence</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/092" definition-exists="false" ipc-concordant="H01S3/092" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S3/092</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>of flash lamp </text><reference><text><class-ref scheme="cpc">H01S3/0937</class-ref> takes precedence </text><CPC-specific-text><text>; flash lamps <u>per se</u> <class-ref scheme="cpc">H01J61/80</class-ref>; circuit arrangements for operating flash lamps in general <class-ref scheme="cpc">H05B41/30</class-ref></text></CPC-specific-text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/093" definition-exists="false" ipc-concordant="H01S3/093" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/093</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>focusing or directing the excitation energy into the active medium</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/0931" definition-exists="false" ipc-concordant="H01S3/093" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0931</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Imaging pump cavity, e.g. elliptical</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0933" definition-exists="false" ipc-concordant="H01S3/0933" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0933</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of a semiconductor, e.g. light emitting diode</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0937" definition-exists="false" ipc-concordant="H01S3/0937" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0937</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>produced by exploding or combustible material</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/094" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H01S3/094</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by coherent light</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> Groups <class-ref scheme="cpc">H01S3/094003</class-ref>&#160;-&#160;<class-ref scheme="cpc">H01S3/094088</class-ref> take precedence over groups <class-ref scheme="cpc">H01S3/0941</class-ref>&#160;-&#160;<class-ref scheme="cpc">H01S3/0947</class-ref></note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094003" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the pumped medium being a fibre</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/094007" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cladding pumping, i.e. pump light propagating in a clad surrounding the active core</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/094011" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094011</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with bidirectional pumping, i.e. with injection of the pump light from both two ends of the fibre</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/094015" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094015</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with pump light recycling, i.e. with reinjection of the unused pump light back into the fiber, e.g. by reflectors or circulators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/094019" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094019</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Side pumped fibre, whereby pump light is coupled laterally into the fibre via an optical component like a prism, or a grating, or via V-groove coupling</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/094023" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with ASE light recycling, with reinjection of the ASE light back into the fiber, e.g. by reflectors or circulators</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094026" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-02-01" status="published"><classification-symbol>H01S3/094026</classification-symbol><class-title date-revised="2018-02-01"><title-part><CPC-specific-text><text>for synchronously pumping, e.g. for mode locking</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/09403" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/09403</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cross-pumping, e.g. F&#246;rster process involving intermediate medium for excitation transfer</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094034" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094034</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the pumped medium being a dye</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094038" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094038</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>End pumping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094042" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094042</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of a fibre laser</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/094046" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>of a Raman fibre laser</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094049" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094049</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Guiding of the pump light</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/094053" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094053</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Fibre coupled pump, e.g. delivering pump light using a fibre or a fibre bundle</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/094057" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094057</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by tapered duct or homogenized light pipe, e.g. for concentrating pump light</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094061" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094061</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Shared pump, i.e. pump light of a single pump source is used to pump plural gain media in parallel</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094065" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Single-mode pumping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094069" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094069</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Multi-mode pumping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094073" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094073</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Non-polarized pump, e.g. depolarizing the pump light for Raman lasers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094076" definition-exists="true" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094076</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pulsed or modulated pumping </text><reference><text><class-ref scheme="cpc">H01S3/1024</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/09408" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/09408</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pump redundancy</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094084" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094084</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with pump light recycling, i.e. with reinjection of the unused pump light, e.g. by reflectors or circulators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094088" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094088</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with ASE light recycling, i.e. with reinjection of the ASE light, e.g. by reflectors or circulators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094092" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094092</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Upconversion pumping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/094096" definition-exists="false" ipc-concordant="H01S3/094" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/094096</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Multi-wavelength pumping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0941" definition-exists="true" ipc-concordant="H01S3/0941" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0941</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of a laser diode</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/09415" definition-exists="false" ipc-concordant="H01S3/0941" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/09415</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the pumping beam being parallel to the lasing mode of the pumped medium, e.g. end-pumping</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0943" definition-exists="false" ipc-concordant="H01S3/0943" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0943</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of a gas laser</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0947" definition-exists="false" ipc-concordant="H01S3/0947" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0947</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>of an organic dye laser</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/095" definition-exists="true" ipc-concordant="H01S3/095" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S3/095</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>using chemical or thermal pumping</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/09505" definition-exists="false" ipc-concordant="H01S3/095" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S3/09505</classification-symbol><class-title date-revised="2017-08-01"><title-part><CPC-specific-text><text>involving photochemical reactions, e.g. photodissociation </text><reference><text>iodine lasers <class-ref scheme="cpc">H01S3/2215</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0951" definition-exists="false" ipc-concordant="H01S3/0951" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0951</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by increasing the pressure in the laser gas medium</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0953" definition-exists="false" ipc-concordant="H01S3/0953" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S3/0953</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Gas dynamic lasers, i.e. with expansion of the laser gas medium to supersonic flow speeds</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/0955" definition-exists="true" ipc-concordant="H01S3/0955" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0955</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using pumping by high energy particles </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H01S3/0903</class-ref>, <class-ref scheme="cpc">H01S3/0906</class-ref>, <class-ref scheme="cpc">H01S3/09707</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0957" definition-exists="false" ipc-concordant="H01S3/0957" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0957</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by high energy nuclear particles</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0959" definition-exists="false" ipc-concordant="H01S3/0959" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0959</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by an electron beam</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/097" definition-exists="false" ipc-concordant="H01S3/097" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/097</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by gas discharge of a gas laser</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/09702" definition-exists="false" ipc-concordant="H01S3/097" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/09702</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details of the driver electronics and electric discharge circuits</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/09705" definition-exists="false" ipc-concordant="H01S3/097" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/09705</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with particular means for stabilising the discharge</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/09707" definition-exists="false" ipc-concordant="H01S3/097" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/09707</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using an electron or ion beam </text><reference><text>free-electron laser <class-ref scheme="cpc">H01S3/0903</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0971" definition-exists="true" ipc-concordant="H01S3/0971" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0971</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>transversely excited </text><reference><text><class-ref scheme="cpc">H01S3/0975</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/09713" definition-exists="false" ipc-concordant="H01S3/0971" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/09713</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with auxiliary ionisation, e.g. double discharge excitation</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/09716" definition-exists="false" ipc-concordant="H01S3/0971" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/09716</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by ionising radiation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/0973" definition-exists="false" ipc-concordant="H01S3/0973" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0973</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having a travelling wave passing through the active medium</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0975" definition-exists="false" ipc-concordant="H01S3/0975" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0975</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using inductive or capacitive excitation</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0977" definition-exists="true" ipc-concordant="H01S3/0977" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0977</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having auxiliary ionisation means </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H01S3/09713</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/09775" definition-exists="false" ipc-concordant="H01S3/0977" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/09775</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by ionising radiation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/0979" definition-exists="false" ipc-concordant="H01S3/0979" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/0979</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gas dynamic lasers, i.e. with expansion of the laser gas medium to supersonic flow speeds</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S3/10" definition-exists="true" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S3/10</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> Group <class-ref scheme="cpc">H01S3/10007</class-ref> takes precedence over groups <class-ref scheme="cpc">H01S3/102</class-ref>&#160;-&#160;<class-ref scheme="cpc">H01S3/104</class-ref></note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/10007" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S3/10007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in optical amplifiers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1001" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S3/1001</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>by controlling the optical pumping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/10013" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S3/10013</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>by controlling the temperature of the active medium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/10015" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/10015</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by monitoring or controlling, e.g. attenuating, the input signal</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/10023" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/10023</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by functional association of additional optical elements, e.g. filters, gratings, reflectors</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1003" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-08-01" status="published"><classification-symbol>H01S3/1003</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>tunable optical elements, e.g. acousto-optic filters, tunable gratings</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/10038" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/10038</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Amplitude control</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/10046" definition-exists="true" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/10046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pulse repetition rate control </text><reference><text><class-ref scheme="cpc">H01S3/11</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/10053" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/10053</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Phase control</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/10061" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/10061</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Polarization control</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/10069" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/10069</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Memorized or pre-programmed characteristics, e.g. look-up table [LUT]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/10076" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/10076</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using optical phase conjugation, e.g. phase conjugate reflection</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/10084" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/10084</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Frequency control by seeding</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/10092" definition-exists="false" ipc-concordant="H01S3/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/10092</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coherent seed, e.g. injection locking</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/101" definition-exists="true" ipc-concordant="H01S3/101" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S3/101</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Lasers provided with means to change the location from which, or the direction in which, laser radiation is emitted</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/102" definition-exists="true" ipc-concordant="H01S3/102" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/102</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by controlling the active medium, e.g. by controlling the processes or apparatus for excitation </text><reference><text><class-ref scheme="cpc">H01S3/13</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1022" definition-exists="false" ipc-concordant="H01S3/102" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1022</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by controlling the optical pumping</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1024" definition-exists="true" ipc-concordant="H01S3/102" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1024</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for pulse generation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1026" definition-exists="false" ipc-concordant="H01S3/102" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1026</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling the active medium by translation or rotation, e.g. to remove heat from that part of the active medium that is situated on the resonator axis</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1028" definition-exists="false" ipc-concordant="H01S3/102" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by controlling the temperature</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/104" definition-exists="false" ipc-concordant="H01S3/104" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/104</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in gas lasers</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/105" definition-exists="false" ipc-concordant="H01S3/105" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H01S3/105</classification-symbol><class-title date-revised="2016-08-01"><title-part><text>by controlling the mutual position or the reflecting properties of the reflectors of the cavity </text><CPC-specific-text><text>, e.g. by controlling the cavity length</text></CPC-specific-text><reference><CPC-specific-text><text><class-ref scheme="cpc">H01S3/10076</class-ref></text></CPC-specific-text><text>, <class-ref scheme="cpc">H01S3/13</class-ref> take precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1051" definition-exists="false" ipc-concordant="H01S3/105" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1051</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>one of the reflectors being of the type using frustrated reflection</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1053" definition-exists="false" ipc-concordant="H01S3/105" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1053</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Control by pressure or deformation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1055" definition-exists="false" ipc-concordant="H01S3/1055" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1055</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>one of the reflectors being constituted by a diffraction grating</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/106" definition-exists="false" ipc-concordant="H01S3/106" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/106</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>by controlling devices placed within the cavity </text><reference><CPC-specific-text><text><class-ref scheme="cpc">H01S3/10076</class-ref>,</text></CPC-specific-text><text> <class-ref scheme="cpc">H01S3/13</class-ref> take precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1061" definition-exists="false" ipc-concordant="H01S3/106" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1061</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a variable absorption device</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1062" definition-exists="false" ipc-concordant="H01S3/106" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1062</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a controlled passive interferometer, e.g. a Fabry-Perot etalon</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1063" definition-exists="false" ipc-concordant="H01S3/106" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a solid state device provided with at least one potential jump barrier</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1065" definition-exists="false" ipc-concordant="H01S3/106" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1065</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using liquid crystals</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1066" definition-exists="false" ipc-concordant="H01S3/106" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1066</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a magneto-optical device</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1067" definition-exists="false" ipc-concordant="H01S3/106" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1067</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using pressure or deformation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1068" definition-exists="false" ipc-concordant="H01S3/106" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using an acousto-optical device</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/107" definition-exists="false" ipc-concordant="H01S3/107" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/107</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>using electro-optic devices, e.g. exhibiting Pockels or Kerr effect </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H01S3/1061</class-ref>, <class-ref scheme="cpc">H01S3/1063</class-ref>, <class-ref scheme="cpc">H01S3/1065</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1075" definition-exists="false" ipc-concordant="H01S3/107" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1075</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for optical deflection</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/108" definition-exists="true" ipc-concordant="H01S3/108" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/108</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>using non-linear optical devices, e.g. exhibiting Brillouin or Raman scattering </text><CPC-specific-text><reference><text>mode locking using a non-linear element <class-ref scheme="cpc">H01S3/1112</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1083" definition-exists="false" ipc-concordant="H01S3/108" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1083</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using parametric generation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1086" definition-exists="false" ipc-concordant="H01S3/108" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using scattering effects, e.g. Raman or Brillouin effect</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/109" definition-exists="false" ipc-concordant="H01S3/109" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/109</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Frequency multiplication, e.g. harmonic generation</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1095" definition-exists="false" ipc-concordant="H01S3/109" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1095</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>self doubling, e.g. lasing and frequency doubling by the same active medium</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/11" definition-exists="true" ipc-concordant="H01S3/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/11</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Mode locking</text></title-part><title-part><text>Q-switching</text></title-part><title-part><text>Other giant-pulse techniques, e.g. cavity dumping</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-source">Group <class-ref scheme="cpc">H01S3/11</class-ref> is impacted by reclassification into group <class-ref scheme="cpc">H01S3/1123</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S3/11</class-ref> and <class-ref scheme="cpc">H01S3/1123</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1103" definition-exists="false" ipc-concordant="H01S3/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1103</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cavity dumping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1106" definition-exists="false" ipc-concordant="H01S3/1106" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/1106</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Mode locking</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1109" definition-exists="false" ipc-concordant="H01S3/1109" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/1109</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Active mode locking</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1112" definition-exists="false" ipc-concordant="H01S3/1112" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/1112</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Passive mode locking</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1115" definition-exists="false" ipc-concordant="H01S3/1115" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/1115</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>using intracavity saturable absorbers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S3/1118" definition-exists="false" ipc-concordant="H01S3/1118" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/1118</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Semiconductor saturable absorbers, e.g. semiconductor saturable absorber mirrors [SESAMs]</text></title-part><title-part><text>Solid-state saturable absorbers, e.g. carbon nanotube [CNT] based</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1121" definition-exists="false" ipc-concordant="H01S3/1106" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/1121</classification-symbol><class-title date-revised="2018-02-01"><title-part><CPC-specific-text><text>Harmonically mode locking lasers, e.g. modulation frequency equals multiple integers or a fraction of the resonator roundtrip time</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1123" definition-exists="false" ipc-concordant="H01S3/1123" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/1123</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Q-switching</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">H01S3/1123</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">H01S3/11</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S3/11</class-ref> and <class-ref scheme="cpc">H01S3/1123</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1124" definition-exists="false" ipc-concordant="H01S3/1123" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/1124</classification-symbol><class-title date-revised="2023-01-01"><title-part><CPC-specific-text><text>using magneto-optical devices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1127" definition-exists="false" ipc-concordant="H01S3/1123" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/1127</classification-symbol><class-title date-revised="2023-01-01"><title-part><CPC-specific-text><text>using pulse transmission mode [PTM]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/113" definition-exists="false" ipc-concordant="H01S3/113" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/113</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>using intracavity saturable absorbers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/115" definition-exists="false" ipc-concordant="H01S3/115" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/115</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>using intracavity electro-optic devices</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/117" definition-exists="false" ipc-concordant="H01S3/117" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/117</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>using intracavity acousto-optic devices</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/121" definition-exists="false" ipc-concordant="H01S3/121" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/121</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>using intracavity mechanical devices</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/123" definition-exists="false" ipc-concordant="H01S3/123" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/123</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>using rotating mirrors</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/125" definition-exists="false" ipc-concordant="H01S3/125" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/125</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>using rotating prisms</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/127" definition-exists="false" ipc-concordant="H01S3/127" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/127</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Plural Q-switches</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/13" definition-exists="false" ipc-concordant="H01S3/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/13</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>Stabilisation of laser output parameters, e.g. frequency or amplitude</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> Group <class-ref scheme="cpc">H01S3/1301</class-ref> takes precedence over groups <class-ref scheme="cpc">H01S3/131</class-ref>&#160;-&#160;<class-ref scheme="cpc">H01S3/134</class-ref></note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1301" definition-exists="false" ipc-concordant="H01S3/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S3/1301</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in optical amplifiers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/13013" definition-exists="false" ipc-concordant="H01S3/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S3/13013</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>by controlling the optical pumping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/13017" definition-exists="false" ipc-concordant="H01S3/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S3/13017</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>by controlling the temperature of the active medium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1302" definition-exists="false" ipc-concordant="H01S3/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1302</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by all-optical means, e.g. gain-clamping</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1303" definition-exists="false" ipc-concordant="H01S3/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1303</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a passive reference, e.g. absorption cell </text><reference><text><class-ref scheme="cpc">H01S3/139</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1304" definition-exists="false" ipc-concordant="H01S3/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1304</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using an active reference, e.g. second laser, klystron or other standard frequency source </text><reference><text><class-ref scheme="cpc">H01S3/139</class-ref> takes precedence; automatic control of electronic generators <class-ref scheme="cpc">H03L7/00</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1305" definition-exists="false" ipc-concordant="H01S3/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1305</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Feedback control systems</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1306" definition-exists="false" ipc-concordant="H01S3/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1306</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Stabilisation of the amplitude</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1307" definition-exists="false" ipc-concordant="H01S3/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1307</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Stabilisation of the phase</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1308" definition-exists="false" ipc-concordant="H01S3/13" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1308</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Stabilisation of the polarisation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/131" definition-exists="false" ipc-concordant="H01S3/131" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/131</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by controlling the active medium, e.g. by controlling the processes or apparatus for excitation</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1312" definition-exists="false" ipc-concordant="H01S3/131" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1312</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by controlling the optical pumping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1315" definition-exists="false" ipc-concordant="H01S3/131" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1315</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by gain saturation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1317" definition-exists="false" ipc-concordant="H01S3/131" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1317</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by controlling the temperature</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/134" definition-exists="false" ipc-concordant="H01S3/134" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/134</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in gas lasers</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/136" definition-exists="false" ipc-concordant="H01S3/136" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/136</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>by controlling devices placed within the cavity</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/137" definition-exists="false" ipc-concordant="H01S3/137" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/137</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for stabilising of frequency</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/139" definition-exists="false" ipc-concordant="H01S3/139" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H01S3/139</classification-symbol><class-title date-revised="2016-08-01"><title-part><text>by controlling the mutual position or the reflecting properties of the reflectors of the cavity </text><CPC-specific-text><text>, e.g. by controlling the cavity length</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1392" definition-exists="false" ipc-concordant="H01S3/139" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1392</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a passive reference, e.g. absorption cell </text><reference><text><class-ref scheme="cpc">H01S3/1396</class-ref>, <class-ref scheme="cpc">H01S3/1398</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1394" definition-exists="false" ipc-concordant="H01S3/139" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1394</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using an active reference, e.g. second laser, klystron or other standard frequency source</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1396" definition-exists="false" ipc-concordant="H01S3/139" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1396</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using two modes present, e.g. Zeeman splitting </text><reference><text><class-ref scheme="cpc">H01S3/1398</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1398" definition-exists="false" ipc-concordant="H01S3/139" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1398</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a supplementary modulation of the output</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S3/14" definition-exists="false" ipc-concordant="H01S3/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>characterised by the material used as the active medium</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/16" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Solid materials</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1601" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1601</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by an active (lasing) ion</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1603" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1603</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>rare earth</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1605" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1605</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>terbium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1606" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1606</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>dysprosium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1608" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1608</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>erbium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/161" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/161</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>holmium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1611" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1611</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>neodymium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1613" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1613</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>praseodymium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1615" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1615</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>samarium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1616" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1616</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>thulium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1618" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1618</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>ytterbium</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/162" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/162</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>transition metal</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1621" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1621</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>cobalt</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1623" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1623</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>chromium, e.g. Alexandrite</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1625" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1625</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>titanium</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1626" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1626</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>uranium</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1628" definition-exists="true" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1628</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by a semiconducting matrix</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/163" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/163</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by a crystal matrix</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1631" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1631</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>aluminate</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1633" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H01S3/1633</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>BeAl<sub>2</sub>O<sub>4</sub>, i.e. Chrysoberyl</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1635" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1635</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>LaMgAl<sub>11</sub>O<sub>19</sub> (LNA, Lanthanum Magnesium Hexaluminate)</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1636" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1636</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Al<sub>2</sub>O<sub>3</sub> (Sapphire)</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1638" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1638</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>YAlO<sub>3</sub> (YALO or YAP, Yttrium Aluminium Perovskite)</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/164" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/164</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>garnet</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1641" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1641</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>GGG</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1643" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1643</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>YAG</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1645" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1645</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>halide</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1646" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1646</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>BaY<sub>2</sub>F<sub>8</sub></text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1648" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1648</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with the formula XYZF6 (Colquiriite structure), wherein X is Li, Na, K or Rb, Y is Mg, Ca, Sr, Cd or Ba and Z is Al, Sc or Ga</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/165" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/165</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with the formula MF2, wherein M is Ca, Sr or Ba</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1651" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1651</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>SrAlF<sub>5</sub></text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1653" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1653</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>YLiF<sub>4</sub>(YLF, LYF)</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1655" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1655</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>silicate</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1656" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1656</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>BeAl<sub>2</sub>(SiO<sub>3</sub>)<sub>6</sub></text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1658" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1658</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Mg<sub>2</sub>SiO<sub>4</sub> (Forsterite)</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/166" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/166</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>La<sub>3</sub>Ga<sub>5</sub>SiO<sub>14</sub> [LGS]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1661" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1661</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Y<sub>2</sub>SiO<sub>5</sub> [YSO]</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1663" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1663</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>beryllate</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1665" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1665</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>La<sub>2</sub>Be<sub>2</sub>O<sub>5</sub> [BEL]</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1666" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1666</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>borate, carbonate, arsenide</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1668" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1668</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>scandate</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/167" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/167</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Sc<sub>2</sub>O<sub>3</sub></text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1671" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1671</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>vanadate, niobate, tantalate</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1673" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1673</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>YVO<sub>4</sub> [YVO]</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1675" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1675</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>titanate, germanate, molybdate, tungstate</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1676" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1676</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Li<sub>4</sub>Ge<sub>5</sub>O<sub>12</sub></text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/1678" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1678</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>LaBGeO<sub>5</sub></text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/168" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/168</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using an organic dye dispersed in a solid matrix</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1681" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1681</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using colour centres</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1683" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H01S3/1683</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>using superconductivity, e.g. provided with Josephson junctions</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1685" definition-exists="true" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1685</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Ceramics</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1686" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1686</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Liquid crystal active layer</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1688" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1688</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Stoichiometric laser compounds, i.e. in which the active element forms one component of a stoichiometric formula rather than being merely a dopant</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/169" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/169</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Nanoparticles, e.g. doped nanoparticles acting as a gain material</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/1691" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1691</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by additives / sensitisers / promoters as further dopants</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1693" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1693</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>aluminium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1695" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1695</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>germanium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1696" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1696</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>transition metal</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/1698" definition-exists="false" ipc-concordant="H01S3/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/1698</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>rare earth</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/17" definition-exists="true" ipc-concordant="H01S3/17" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S3/17</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>amorphous, e.g. glass</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/171" definition-exists="false" ipc-concordant="H01S3/17" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/171</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>chalcogenide glass</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/172" definition-exists="false" ipc-concordant="H01S3/17" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/172</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>selenide glass</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/173" definition-exists="false" ipc-concordant="H01S3/17" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/173</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>fluoride glass, e.g. fluorozirconate or ZBLAN [ ZrF<sub>4</sub>-BaF<sub>2</sub>-LaF<sub>3</sub>-AlF<sub>3</sub>-NaF]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/175" definition-exists="false" ipc-concordant="H01S3/17" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/175</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>phosphate glass</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/176" definition-exists="false" ipc-concordant="H01S3/17" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/176</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>silica or silicate glass</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/177" definition-exists="false" ipc-concordant="H01S3/17" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/177</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>telluride glass</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/178" definition-exists="false" ipc-concordant="H01S3/17" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/178</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>plastic</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/20" definition-exists="false" ipc-concordant="H01S3/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/20</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Liquids</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/207" definition-exists="false" ipc-concordant="H01S3/207" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H01S3/207</classification-symbol><class-title date-revised="2016-08-01"><title-part><text>including a chelate </text><CPC-specific-text><text>, e.g. including atoms or ions, e.g. Nd</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/213" definition-exists="false" ipc-concordant="H01S3/213" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/213</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>including an organic dye</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/22" definition-exists="false" ipc-concordant="H01S3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gases</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/2207" definition-exists="false" ipc-concordant="H01S3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2207</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Noble gas ions, e.g. Ar+&gt;, Kr+&gt;</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/2215" definition-exists="false" ipc-concordant="H01S3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2215</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Iodine compounds or atomic iodine</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/2222" definition-exists="false" ipc-concordant="H01S3/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2222</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Neon, e.g. in helium-neon (He-Ne) systems</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/223" definition-exists="false" ipc-concordant="H01S3/223" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-01-01" status="published"><classification-symbol>H01S3/223</classification-symbol><class-title date-revised="2023-01-01"><title-part><text>the active gas being polyatomic, i.e. containing two or more atoms </text><reference><text><class-ref scheme="cpc">H01S3/227</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/2232" definition-exists="false" ipc-concordant="H01S3/223" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2232</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Carbon dioxide (CO<sub>2</sub>) or monoxide [CO]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/2235" definition-exists="false" ipc-concordant="H01S3/223" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2235</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Dye vapour</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/2237" definition-exists="false" ipc-concordant="H01S3/223" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2237</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Molecular nitrogen (N<sub>2</sub>), e.g. in noble gas-N<sub>2</sub> systems</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/225" definition-exists="false" ipc-concordant="H01S3/225" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/225</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>comprising an excimer or exciplex</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/2251" definition-exists="false" ipc-concordant="H01S3/225" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2251</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>ArF, i.e. argon fluoride is comprised for lasing around 193 nm</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/2253" definition-exists="false" ipc-concordant="H01S3/225" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2253</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>XeCl, i.e. xenon chloride is comprised for lasing around 308 nm</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/2255" definition-exists="false" ipc-concordant="H01S3/225" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2255</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>XeF, i.e. xenon fluoride is comprised for lasing around 351 nm</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/2256" definition-exists="false" ipc-concordant="H01S3/225" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2256</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>KrF, i.e. krypton fluoride is comprised for lasing around 248 nm</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S3/2258" definition-exists="false" ipc-concordant="H01S3/225" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2258</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>F2, i.e. molecular fluoride is comprised for lasing around 157 nm</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/227" definition-exists="false" ipc-concordant="H01S3/227" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/227</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Metal vapour</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S3/23" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H01S3/23</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Arrangements of two or more lasers not provided for in groups <class-ref scheme="cpc">H01S3/02</class-ref>&#160;-&#160;<class-ref scheme="cpc">H01S3/22</class-ref>, e.g. tandem arrangements of separate active media</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/2308" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2308</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Amplifier arrangements, e.g. MOPA</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/2316" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2316</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cascaded amplifiers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/2325" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2325</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Multi-pass amplifiers, e.g. regenerative amplifiers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/2333" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2333</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Double-pass amplifiers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/2341" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2341</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Four pass amplifiers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S3/235" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/235</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Regenerative amplifiers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/2358" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2358</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising dyes as the active medium</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/2366" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2366</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising a gas as the active medium </text><reference><text><class-ref scheme="cpc">H01S3/10092</class-ref>, <class-ref scheme="cpc">H01S3/2383</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/2375" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2375</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Hybrid lasers </text><reference><text><class-ref scheme="cpc">H01S3/07</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/2383" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2383</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Parallel arrangements</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S3/2391" definition-exists="false" ipc-concordant="H01S3/23" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/2391</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>emitting at different wavelengths</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S3/30" definition-exists="false" ipc-concordant="H01S3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>using scattering effects, e.g. stimulated Brillouin or Raman effects</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/302" definition-exists="false" ipc-concordant="H01S3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/302</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in an optical fibre</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/305" definition-exists="false" ipc-concordant="H01S3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/305</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in a gas</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S3/307" definition-exists="false" ipc-concordant="H01S3/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S3/307</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in a liquid</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H01S4/00" definition-exists="true" ipc-concordant="H01S4/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S4/00</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Devices using stimulated emission of electromagnetic radiation in wave ranges other than those covered by groups <class-ref scheme="cpc">H01S1/00</class-ref>, <class-ref scheme="cpc">H01S3/00</class-ref> or <class-ref scheme="cpc">H01S5/00</class-ref>, e.g. phonon masers, X-ray lasers or gamma-ray lasers</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="7" additional-only="false" sort-key="H01S5/00" definition-exists="true" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/00</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Semiconductor lasers </text><reference><text>superluminescent diodes <class-ref scheme="cpc">H01L33/00</class-ref></text></reference></title-part></class-title><notes-and-warnings><note type="note"><note-paragraph> Attention is drawn to Special Rules of classification at <class-ref scheme="cpc">C07F</class-ref>, which Special Rules indicate to which version of the periodic table of chemical elements CPC refers. In this group, the Periodic System used is the 8 group system indicated by Roman numerals in the Periodic Table thereunder. </note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S5/0014" definition-exists="false" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0014</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Measuring characteristics or properties thereof </text><reference><text>measuring techniques <u>per se</u> <class-ref scheme="cpc">G01J</class-ref>, <class-ref scheme="cpc">G01K</class-ref>, <class-ref scheme="cpc">G01N</class-ref>, <class-ref scheme="cpc">G01R</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0021" definition-exists="false" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Degradation or life time measurements</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0028" definition-exists="false" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Laser diodes used as detectors</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0035" definition-exists="false" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0035</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Simulations of laser characteristics</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0042" definition-exists="false" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0042</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>On wafer testing, e.g. lasers are tested before separating wafer into chips</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S5/005" definition-exists="false" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-01-01" status="published"><classification-symbol>H01S5/005</classification-symbol><class-title date-revised="2021-01-01"><title-part><CPC-specific-text><text>Optical components external to the laser cavity, specially adapted therefor, e.g. for homogenisation or merging of the beams or for manipulating laser pulses, e.g. pulse shaping </text><reference><text><class-ref scheme="cpc">H01S5/026</class-ref>, <class-ref scheme="cpc">H01S5/18388</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0057" definition-exists="false" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0057</classification-symbol><class-title date-revised="2021-01-01"><title-part><CPC-specific-text><text>for temporal shaping, e.g. pulse compression, frequency chirping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0064" definition-exists="false" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0064</classification-symbol><class-title date-revised="2021-01-01"><title-part><CPC-specific-text><text>Anti-reflection components, e.g. optical isolators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0071" definition-exists="false" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0071</classification-symbol><class-title date-revised="2021-01-01"><title-part><CPC-specific-text><text>for beam steering, e.g. using a mirror outside the cavity to change the beam direction</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0078" definition-exists="false" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0078</classification-symbol><class-title date-revised="2021-01-01"><title-part><CPC-specific-text><text>for frequency filtering</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0085" definition-exists="false" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0085</classification-symbol><class-title date-revised="2021-01-01"><title-part><CPC-specific-text><text>for modulating the output, i.e. the laser beam is modulated outside the laser cavity</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0087" definition-exists="true" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-01-01" status="published"><classification-symbol>H01S5/0087</classification-symbol><class-title date-revised="2021-01-01"><title-part><CPC-specific-text><text>for illuminating phosphorescent or fluorescent materials, e.g. using optical arrangements specifically adapted for guiding or shaping laser beams illuminating these materials</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0092" definition-exists="true" ipc-concordant="H01S5/00" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0092</classification-symbol><class-title date-revised="2021-01-01"><title-part><CPC-specific-text><text>for nonlinear frequency conversion, e.g. second harmonic generation [SHG] or sum- or difference-frequency generation outside the laser cavity</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S5/02" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Structural details or components not essential to laser action</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0201" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0201</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Separation of the wafer into individual elements, e.g. by dicing, cleaving, etching or directly during growth</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0202" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0202</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Cleaving</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0203" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0203</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Etching</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0205" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>during growth of the semiconductor body</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0206" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0206</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Substrates, e.g. growth, shape, material, removal or bonding; </text><reference><text>specific crystal orientation <class-ref scheme="cpc">H01S5/3202</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0207" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0207</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Substrates having a special shape</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0208" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0208</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Semi-insulating substrates</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/021" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Silicon based substrates</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0211" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0211</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Substrates made of ternary or quaternary compounds</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0212" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0212</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a graded composition</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0213" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0213</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Sapphire, quartz or diamond based substrates</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0215" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0215</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Bonding to the substrate</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0216" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0216</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using an intermediate compound, e.g. a glue or solder</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0217" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0217</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Removal of the substrate</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0218" definition-exists="false" ipc-concordant="H01S5/02" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0218</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Substrates comprising semiconducting materials from different groups of the periodic system than the active layer</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/022" definition-exists="true" ipc-concordant="H01S5/022" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/022</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Mountings</text></title-part><title-part><text>Housings</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-source">Group <class-ref scheme="cpc">H01S5/022</class-ref> is impacted by reclassification into groups <class-ref scheme="cpc">H01S5/02218</class-ref> and <class-ref scheme="cpc">H01S5/0239</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S5/022</class-ref>, <class-ref scheme="cpc">H01S5/02218</class-ref>, and <class-ref scheme="cpc">H01S5/0239</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/02208" definition-exists="false" ipc-concordant="H01S5/02208" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02208</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>characterised by the shape of the housings</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02212" definition-exists="false" ipc-concordant="H01S5/02212" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02212</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Can-type, e.g. TO-CAN housings with emission along or parallel to symmetry axis</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02216" definition-exists="false" ipc-concordant="H01S5/02216" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02216</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Butterfly-type, i.e. with electrode pins extending horizontally from the housings</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/02218" definition-exists="false" ipc-concordant="H01S5/02218" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02218</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Material of the housings</text></title-part><title-part><text>Filling of the housings</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">H01S5/02218</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">H01S5/022</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S5/022</class-ref> and <class-ref scheme="cpc">H01S5/02218</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0222" definition-exists="false" ipc-concordant="H01S5/0222" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0222</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Gas-filled housings</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/02224" definition-exists="false" ipc-concordant="H01S5/02224" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02224</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>the gas comprising oxygen, e.g. for avoiding contamination of the light emitting facets</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02232" definition-exists="false" ipc-concordant="H01S5/02232" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02232</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Liquid-filled housings</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02234" definition-exists="false" ipc-concordant="H01S5/02234" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02234</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Resin-filled housings</text></title-part><title-part><text>the housings being made of resin</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/02235" definition-exists="false" ipc-concordant="H01S5/02235" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02235</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Getter material for absorbing contamination</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0225" definition-exists="false" ipc-concordant="H01S5/0225" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0225</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Out-coupling of light</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02251" definition-exists="false" ipc-concordant="H01S5/02251" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02251</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>using optical fibres</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02253" definition-exists="false" ipc-concordant="H01S5/02253" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02253</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>using lenses</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02255" definition-exists="false" ipc-concordant="H01S5/02255" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02255</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>using beam deflecting elements</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02257" definition-exists="false" ipc-concordant="H01S5/02257" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02257</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>using windows, e.g. specially adapted for back-reflecting light to a detector inside the housing</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/023" definition-exists="false" ipc-concordant="H01S5/023" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/023</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Mount members, e.g. sub-mount members</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-source">Group <class-ref scheme="cpc">H01S5/023</class-ref> is impacted by reclassification into group <class-ref scheme="cpc">H01S5/02315</class-ref>. <br/>Groups <class-ref scheme="cpc">H01S5/023</class-ref> and <class-ref scheme="cpc">H01S5/02315</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0231" definition-exists="false" ipc-concordant="H01S5/0231" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0231</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Stems</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-source">Group <class-ref scheme="cpc">H01S5/0231</class-ref> is impacted by reclassification into group <class-ref scheme="cpc">H01S5/0232</class-ref>. <br/>Groups <class-ref scheme="cpc">H01S5/0231</class-ref> and <class-ref scheme="cpc">H01S5/0232</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02315" definition-exists="false" ipc-concordant="H01S5/02315" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02315</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Support members, e.g. bases or carriers</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">H01S5/02315</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">H01S5/023</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S5/023</class-ref> and <class-ref scheme="cpc">H01S5/02315</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0232" definition-exists="false" ipc-concordant="H01S5/0232" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0232</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Lead-frames</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">H01S5/0232</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">H01S5/0231</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S5/0231</class-ref> and <class-ref scheme="cpc">H01S5/0232</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02325" definition-exists="false" ipc-concordant="H01S5/02325" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02325</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Mechanically integrated components on mount members or optical micro-benches</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/02326" definition-exists="false" ipc-concordant="H01S5/02326" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02326</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Arrangements for relative positioning of laser diodes and optical components, e.g. grooves in the mount to fix optical fibres or lenses</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0233" definition-exists="false" ipc-concordant="H01S5/0233" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0233</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Mounting configuration of laser chips</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-source">Group <class-ref scheme="cpc">H01S5/0233</class-ref> is impacted by reclassification into group <class-ref scheme="cpc">H01S5/02335</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S5/0233</class-ref> and <class-ref scheme="cpc">H01S5/02335</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02335" definition-exists="false" ipc-concordant="H01S5/02335" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2022-01-01" status="published"><classification-symbol>H01S5/02335</classification-symbol><class-title date-revised="2022-01-01"><title-part><text>Up-side up mountings, e.g. epi-side up mountings or junction up mountings</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">H01S5/02335</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">H01S5/0233</class-ref>. <br/>Groups <class-ref scheme="cpc">H01S5/0233</class-ref> and <class-ref scheme="cpc">H01S5/02335</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0234" definition-exists="false" ipc-concordant="H01S5/0234" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0234</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Up-side down mountings, e.g. Flip-chip, epi-side down mountings or junction down mountings</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02345" definition-exists="false" ipc-concordant="H01S5/02345" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02345</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Wire-bonding</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0235" definition-exists="false" ipc-concordant="H01S5/0235" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0235</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Method for mounting laser chips</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02355" definition-exists="false" ipc-concordant="H01S5/02355" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02355</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Fixing laser chips on mounts</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/0236" definition-exists="false" ipc-concordant="H01S5/0236" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0236</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>using an adhesive</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/02365" definition-exists="false" ipc-concordant="H01S5/02365" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02365</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>by clamping</text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/0237" definition-exists="false" ipc-concordant="H01S5/0237" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0237</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>by soldering</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02375" definition-exists="false" ipc-concordant="H01S5/02375" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02375</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Positioning of the laser chips</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-source">Group <class-ref scheme="cpc">H01S5/02375</class-ref> is impacted by reclassification into groups <class-ref scheme="cpc">H01S5/0238</class-ref> and <class-ref scheme="cpc">H01S5/02385</class-ref>. <br/>Groups <class-ref scheme="cpc">H01S5/02375</class-ref>, <class-ref scheme="cpc">H01S5/0238</class-ref>, and <class-ref scheme="cpc">H01S5/02385</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/0238" definition-exists="false" ipc-concordant="H01S5/0238" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0238</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>using marks</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">H01S5/0238</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">H01S5/02375</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S5/02375</class-ref> and <class-ref scheme="cpc">H01S5/0238</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/02385" definition-exists="false" ipc-concordant="H01S5/02385" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/02385</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>using laser light as reference</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">H01S5/02385</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">H01S5/02375</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S5/02375</class-ref> and <class-ref scheme="cpc">H01S5/02385</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0239" definition-exists="false" ipc-concordant="H01S5/0239" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/0239</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Combinations of electrical or optical elements</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">H01S5/0239</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">H01S5/022</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S5/022</class-ref> and <class-ref scheme="cpc">H01S5/0239</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/024" definition-exists="true" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/024</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Arrangements for thermal management</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/02407" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/02407</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Active cooling, e.g. the laser temperature is controlled by a thermo-electric cooler or water cooling</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02415" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/02415</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by using a thermo-electric cooler [TEC], e.g. Peltier element</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02423" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/02423</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Liquid cooling, e.g. a liquid cools a mount of the laser</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/0243" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0243</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Laser is immersed in the coolant, i.e. the whole laser chip is immersed in the liquid for cooling</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/02438" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H01S5/02438</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Characterized by cooling of elements other than the laser chip, e.g. an optical element being part of an external cavity or a collimating lens</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02446" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H01S5/02446</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>Cooling being separate from the laser chip cooling</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/02453" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/02453</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Heating, e.g. the laser is heated for stabilisation against temperature fluctuations of the environment </text><reference><text><class-ref scheme="cpc">H01S5/0612</class-ref> takes precedence, for monolithically integrated heaters <u>see</u> also <class-ref scheme="cpc">H01S5/0261</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/02461" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/02461</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Structure or details of the laser chip to manipulate the heat flow, e.g. passive layers in the chip with a low heat conductivity</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/02469" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/02469</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Passive cooling, e.g. where heat is removed by the housing as a whole or by a heat pipe without any active cooling element like a TEC</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/02476" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/02476</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Heat spreaders, i.e. improving heat flow between laser chip and heat dissipating elements</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02484" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/02484</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Sapphire or diamond heat spreaders</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/02492" definition-exists="false" ipc-concordant="H01S5/024" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/02492</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>CuW heat spreaders</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/026" definition-exists="true" ipc-concordant="H01S5/026" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S5/026</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Monolithically integrated components, e.g. waveguides, monitoring photo-detectors, drivers </text><reference><text>stabilisation of output <class-ref scheme="cpc">H01S5/06</class-ref></text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0261" definition-exists="false" ipc-concordant="H01S5/026" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0261</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Non-optical elements, e.g. laser driver components, heaters </text><reference><text><class-ref scheme="cpc">H01S5/0265</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0262" definition-exists="false" ipc-concordant="H01S5/026" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0262</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Photo-diodes, e.g. transceiver devices, bidirectional devices </text><reference><text><class-ref scheme="cpc">H01S5/0265</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0264" definition-exists="false" ipc-concordant="H01S5/026" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0264</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for monitoring the laser-output</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0265" definition-exists="false" ipc-concordant="H01S5/026" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-02-01" status="published"><classification-symbol>H01S5/0265</classification-symbol><class-title date-revised="2018-02-01"><title-part><CPC-specific-text><text>Intensity modulators </text><reference><text>intra-cavity modulators <class-ref scheme="cpc">H01S5/0625</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0267" definition-exists="false" ipc-concordant="H01S5/026" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0267</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Integrated focusing lens </text><reference><text><class-ref scheme="cpc">H01S5/18388</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0268" definition-exists="false" ipc-concordant="H01S5/026" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0268</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Integrated waveguide grating router, e.g. emission of a multi-wavelength laser array is combined by a &quot;dragon router&quot;</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/028" definition-exists="false" ipc-concordant="H01S5/028" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S5/028</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Coatings </text><CPC-specific-text><text>; Treatment of the laser facets, e.g. etching, passivation layers or reflecting layers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0281" definition-exists="false" ipc-concordant="H01S5/028" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0281</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coatings made of semiconductor materials</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0282" definition-exists="false" ipc-concordant="H01S5/028" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0282</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Passivation layers or treatments</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0283" definition-exists="false" ipc-concordant="H01S5/028" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0283</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Optically inactive coating on the facet, e.g. half-wave coating</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0284" definition-exists="false" ipc-concordant="H01S5/028" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0284</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coatings with a temperature dependent reflectivity</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0285" definition-exists="false" ipc-concordant="H01S5/028" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0285</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coatings with a controllable reflectivity</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0286" definition-exists="false" ipc-concordant="H01S5/028" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0286</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coatings with a reflectivity that is not constant over the facets, e.g. apertures</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0287" definition-exists="false" ipc-concordant="H01S5/028" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0287</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Facet reflectivity</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0288" definition-exists="false" ipc-concordant="H01S5/028" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0288</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Detuned facet reflectivity, i.e. reflectivity peak is different from gain maximum</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S5/04" definition-exists="true" ipc-concordant="H01S5/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Processes or apparatus for excitation, e.g. pumping, </text><CPC-specific-text><text>e.g. by electron beams</text></CPC-specific-text><reference><text><class-ref scheme="cpc">H01S5/06</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/041" definition-exists="false" ipc-concordant="H01S5/04" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/041</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Optical pumping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/042" definition-exists="false" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H01S5/042</classification-symbol><class-title date-revised="2020-05-01"> <title-part><text>Electrical excitation </text><CPC-specific-text><text>; Circuits therefor </text><reference><text>monolithically integrated laser drive components <class-ref scheme="cpc">H01S5/0261</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0421" definition-exists="false" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0421</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the semiconducting contacting layers </text><reference><text>electrodes <class-ref scheme="cpc">H01S5/0425</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0422" definition-exists="false" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0422</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with n- and p-contacts on the same side of the active layer</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/0424" definition-exists="false" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0424</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>lateral current injection</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0425" definition-exists="false" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S5/0425</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>Electrodes, e.g. characterised by the structure</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/04252" definition-exists="false" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S5/04252</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>characterised by the material</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/04253" definition-exists="false" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S5/04253</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>having specific optical properties, e.g. transparent electrodes</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/04254" definition-exists="true" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S5/04254</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>characterised by the shape</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/04256" definition-exists="true" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S5/04256</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>characterised by the configuration</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/04257" definition-exists="false" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S5/04257</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>having positive and negative electrodes on the same side of the substrate</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0427" definition-exists="false" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0427</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for applying modulation to the laser</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0428" definition-exists="false" ipc-concordant="H01S5/042" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0428</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>for applying pulses to the laser</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S5/06" definition-exists="true" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S5/06</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Arrangements for controlling the laser output parameters, e.g. by operating on the active medium</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0601" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0601</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising an absorbing region </text><reference><text><class-ref scheme="cpc">H01S5/0604</class-ref>, <class-ref scheme="cpc">H01S5/0607</class-ref>, <class-ref scheme="cpc">H01S5/0615</class-ref> and <class-ref scheme="cpc">H01S5/065</class-ref> take precedence; bistable laser devices in general <class-ref scheme="cpc">G02F3/026</class-ref></text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0602" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0602</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>which is an umpumped part of the active layer</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0604" definition-exists="true" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0604</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising a non-linear region, e.g. generating harmonics of the laser frequency</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0605" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0605</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Self doubling, e.g. lasing and frequency doubling by the same active medium</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0607" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0607</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by varying physical parameters other than the potential of the electrodes, e.g. by an electric or magnetic field, mechanical deformation, pressure, light, temperature</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0608" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0608</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>controlled by light, e.g. optical switch</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0609" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0609</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>acting on an absorbing region, e.g. wavelength convertors</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/0611" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-05-01" status="published"><classification-symbol>H01S5/0611</classification-symbol><class-title date-revised="2020-05-01"><title-part><CPC-specific-text><text>wavelength convertors</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0612" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0612</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>controlled by temperature</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0614" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-01-01" status="published"><classification-symbol>H01S5/0614</classification-symbol><class-title date-revised="2017-01-01"><title-part><CPC-specific-text><text>controlled by electric field, i.e. whereby an additional electric field is used to tune the bandgap, e.g. using the Stark-effect</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0615" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0615</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Q-switching, i.e. in which the quality factor of the optical resonator is rapidly changed</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0617" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0617</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using memorised or pre-programmed laser characteristics</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/0618" definition-exists="false" ipc-concordant="H01S5/06" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0618</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details on the linewidth enhancement parameter alpha</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/062" definition-exists="true" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/062</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>by varying the potential of the electrodes </text><reference><text><class-ref scheme="cpc">H01S5/065</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/06203" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06203</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Transistor-type lasers </text><reference><text><class-ref scheme="cpc">H01S5/0608</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06206" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06206</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling the frequency of the radiation, e.g. tunable twin-guide lasers [TTG]</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/06209" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06209</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in single-section lasers </text><reference><text><class-ref scheme="cpc">H01S5/0608</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06213" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06213</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Amplitude modulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06216" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06216</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pulse modulation or generation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0622" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0622</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling the frequency of the radiation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/06223" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06223</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using delayed or positive feedback</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/06226" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06226</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Modulation at ultra-high frequencies</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0623" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0623</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using the beating between two closely spaced optical frequencies, i.e. heterodyne mixing</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/06233" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06233</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling other output parameters than intensity or frequency</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06236" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06236</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>controlling the polarisation, e.g. TM/TE polarisation switching</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0624" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0624</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>controlling the near- or far field</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06243" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06243</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>controlling the position or direction of the emitted beam</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06246" definition-exists="false" ipc-concordant="H01S5/062" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06246</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>controlling the phase</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0625" definition-exists="false" ipc-concordant="H01S5/0625" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0625</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>in multi-section lasers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06251" definition-exists="false" ipc-concordant="H01S5/0625" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06251</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Amplitude modulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06253" definition-exists="false" ipc-concordant="H01S5/0625" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06253</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Pulse modulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06255" definition-exists="false" ipc-concordant="H01S5/0625" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06255</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Controlling the frequency of the radiation</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/06256" definition-exists="false" ipc-concordant="H01S5/0625" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06256</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with DBR-structure</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/06258" definition-exists="false" ipc-concordant="H01S5/0625" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06258</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with DFB-structure</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/065" definition-exists="false" ipc-concordant="H01S5/065" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S5/065</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Mode locking</text></title-part><title-part><text>Mode suppression</text></title-part><title-part><text>Mode selection </text><CPC-specific-text><text>; Self pulsating</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0651" definition-exists="false" ipc-concordant="H01S5/065" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0651</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Mode control</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0652" definition-exists="false" ipc-concordant="H01S5/065" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0652</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coherence lowering or collapse, e.g. multimode emission by additional input or modulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0653" definition-exists="false" ipc-concordant="H01S5/065" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0653</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Mode suppression, e.g. specific multimode</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/0654" definition-exists="false" ipc-concordant="H01S5/065" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0654</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Single longitudinal mode emission</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/0655" definition-exists="false" ipc-concordant="H01S5/065" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0655</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Single transverse or lateral mode emission</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0656" definition-exists="false" ipc-concordant="H01S5/065" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0656</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Seeding, i.e. an additional light input is provided for controlling the laser modes, for example by back-reflecting light from an external optical component </text><reference><text><class-ref scheme="cpc">H01S5/14</class-ref>, <class-ref scheme="cpc">H01S5/4062</class-ref> and <class-ref scheme="cpc">H01S5/4006</class-ref> take precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0657" definition-exists="false" ipc-concordant="H01S5/065" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-02-01" status="published"><classification-symbol>H01S5/0657</classification-symbol><class-title date-revised="2018-02-01"><title-part><CPC-specific-text><text>Mode locking, i.e. generation of pulses at a frequency corresponding to a roundtrip in the cavity</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0658" definition-exists="false" ipc-concordant="H01S5/065" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0658</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Self-pulsating</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/068" definition-exists="true" ipc-concordant="H01S5/068" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/068</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Stabilisation of laser output parameters </text><reference><text><class-ref scheme="cpc">H01S5/0625</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/06804" definition-exists="false" ipc-concordant="H01S5/068" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06804</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by monitoring an external parameter, e.g. temperature</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/06808" definition-exists="false" ipc-concordant="H01S5/068" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06808</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by monitoring the electrical laser parameters, e.g. voltage or current</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/06812" definition-exists="false" ipc-concordant="H01S5/068" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06812</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by monitoring or fixing the threshold current or other specific points of the L-I or V-I characteristics</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/06817" definition-exists="false" ipc-concordant="H01S5/068" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06817</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Noise reduction</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/06821" definition-exists="false" ipc-concordant="H01S5/068" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06821</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Stabilising other output parameters than intensity or frequency, e.g. phase, polarisation or far-fields</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/06825" definition-exists="true" ipc-concordant="H01S5/068" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06825</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Protecting the laser, e.g. during switch-on/off, detection of malfunctioning or degradation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/0683" definition-exists="false" ipc-concordant="H01S5/0683" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-11-01" status="published"><classification-symbol>H01S5/0683</classification-symbol><class-title date-revised="2015-11-01"><title-part><text>by monitoring the optical output parameters</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06832" definition-exists="false" ipc-concordant="H01S5/0683" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06832</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Stabilising during amplitude modulation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06835" definition-exists="false" ipc-concordant="H01S5/0683" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06835</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Stabilising during pulse modulation or generation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/06837" definition-exists="false" ipc-concordant="H01S5/0683" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/06837</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Stabilising otherwise than by an applied electric field or current, e.g. by controlling the temperature</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/0687" definition-exists="false" ipc-concordant="H01S5/0687" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/0687</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Stabilising the frequency of the laser</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S5/10" definition-exists="true" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S5/10</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Construction or shape of the optical resonator </text><CPC-specific-text><text>, e.g. extended or external cavity, coupled cavities, bent-guide, varying width, thickness or composition of the active region </text><reference><text><class-ref scheme="cpc">H01S5/20</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1003" definition-exists="true" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1003</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Waveguide having a modified shape along the axis, e.g. branched, curved, tapered, voids</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1007" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1007</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Branched waveguides</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/101" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/101</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Curved waveguide </text><reference><text><class-ref scheme="cpc">H01S5/1243</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1014" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1014</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tapered waveguide, e.g. spotsize converter </text><reference><text><class-ref scheme="cpc">H01S5/1064</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1017" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1017</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Waveguide having a void for insertion of materials to change optical properties</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1021" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1021</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coupled cavities </text><reference><text><class-ref scheme="cpc">H01S5/14</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1025" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Extended cavities</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1028" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1028</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coupling to elements in the cavity, e.g. coupling to waveguides adjacent the active region, e.g. forward coupled [DFC] structures</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1032" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1032</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Coupling to elements comprising an optical axis that is not aligned with the optical axis of the active region</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/1035" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1035</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Forward coupled structures [DFC]</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1039" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1039</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details on the cavity length</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1042" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1042</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Optical microcavities, e.g. cavity dimensions comparable to the wavelength</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1046" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1046</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Comprising interactions between photons and plasmons, e.g. by a corrugated surface</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1053" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-02-01" status="published"><classification-symbol>H01S5/1053</classification-symbol><class-title date-revised="2018-02-01"><title-part><CPC-specific-text><text>Comprising an active region having a varying composition or cross-section in a specific direction</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1057" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1057</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>varying composition along the optical axis</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/106" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/106</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>varying thickness along the optical axis</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1064" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1064</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>varying width along the optical axis</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1067" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1067</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising nanoparticles</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1071" definition-exists="true" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1071</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Ring-lasers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1075" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1075</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Disk lasers with special modes, e.g. whispering gallery lasers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1078" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1078</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with means to control the spontaneous emission, e.g. reducing or reinjection</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1082" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1082</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a special facet structure, e.g. structured, non planar, oblique</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1085" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1085</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Oblique facets</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1089" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1089</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Unstable resonators</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/1092" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1092</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Multi-wavelength lasing</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1096" definition-exists="false" ipc-concordant="H01S5/10" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1096</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in a single cavity</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/11" definition-exists="false" ipc-concordant="H01S5/11" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/11</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Comprising a photonic bandgap structure</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">H01S5/11</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">H01S5/12</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S5/12</class-ref> and <class-ref scheme="cpc">H01S5/11</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/12" definition-exists="true" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/12</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>the resonator having a periodic structure, e.g. in distributed feedback [DFB] lasers </text><reference><text>comprising a photonic bandgap structure <class-ref scheme="cpc">H01S5/11</class-ref>; surface-emitting lasers <class-ref scheme="cpc">H01S5/18</class-ref></text></reference></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-source">Group <class-ref scheme="cpc">H01S5/12</class-ref> is impacted by reclassification into group <class-ref scheme="cpc">H01S5/11</class-ref>. <br/>Groups <class-ref scheme="cpc">H01S5/12</class-ref> and <class-ref scheme="cpc">H01S5/11</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1203" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1203</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>over only a part of the length of the active region</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1206" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1206</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having a non constant or multiplicity of periods</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/1209" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1209</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Sampled grating</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/1212" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1212</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Chirped grating</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/1215" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1215</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Multiplicity of periods</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/1218" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1218</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in superstructured configuration, e.g. more than one period in an alternate sequence</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1221" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1221</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Detuning between Bragg wavelength and gain maximum</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1225" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1225</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a varying coupling constant along the optical axis</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1228" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1228</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>DFB lasers with a complex coupled grating, e.g. gain or loss coupling</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1231" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1231</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Grating growth or overgrowth details</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1234" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1234</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Actively induced grating, e.g. acoustically or electrically induced</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/1237" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1237</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Lateral grating, i.e. grating only adjacent ridge or mesa</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/124" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/124</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>incorporating phase shifts</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/1243" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1243</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by other means than a jump in the grating period, e.g. bent waveguides</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/1246" definition-exists="false" ipc-concordant="H01S5/12" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1246</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>plurality of phase shifts</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/125" definition-exists="false" ipc-concordant="H01S5/125" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-02-01" status="published"><classification-symbol>H01S5/125</classification-symbol><class-title date-revised="2018-02-01"><title-part><text>Distributed Bragg reflector [DBR] lasers</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/14" definition-exists="true" ipc-concordant="H01S5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/14</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>External cavity lasers </text><reference><text><class-ref scheme="cpc">H01S5/18</class-ref> takes precedence; mode locking <class-ref scheme="cpc">H01S5/065</class-ref></text></reference></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> in this group external cavity elements correspond to elements inside the laser cavity but outside the monolithic semiconductor body. These elements correspond to intra cavity elements in <class-ref scheme="cpc">H01S3/00</class-ref></note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/141" definition-exists="false" ipc-concordant="H01S5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/141</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a wavelength selective device, e.g. a grating or etalon </text><reference><text><class-ref scheme="cpc">H01S5/146</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/142" definition-exists="false" ipc-concordant="H01S5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/142</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>which comprises an additional resonator</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/143" definition-exists="false" ipc-concordant="H01S5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/143</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Littman-Metcalf configuration, e.g. laser - grating - mirror</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/145" definition-exists="false" ipc-concordant="H01S5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/145</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Phase conjugate mirrors</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/146" definition-exists="false" ipc-concordant="H01S5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/146</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a fiber as external cavity</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/147" definition-exists="false" ipc-concordant="H01S5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/147</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having specially shaped fibre, e.g. lensed or tapered end portion</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/148" definition-exists="false" ipc-concordant="H01S5/14" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/148</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using a Talbot cavity</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/16" definition-exists="true" ipc-concordant="H01S5/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/16</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Window-type lasers, i.e. with a region of non-absorbing material between the active region and the reflecting surface </text><reference><text><class-ref scheme="cpc">H01S5/14</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/162" definition-exists="false" ipc-concordant="H01S5/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/162</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with window regions made by diffusion or disordening of the active layer</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/164" definition-exists="false" ipc-concordant="H01S5/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/164</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with window regions comprising semiconductor material with a wider bandgap than the active layer</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/166" definition-exists="false" ipc-concordant="H01S5/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/166</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with window regions comprising non-semiconducting materials</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/168" definition-exists="false" ipc-concordant="H01S5/16" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/168</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with window regions comprising current blocking layers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/18" definition-exists="false" ipc-concordant="H01S5/18" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/18</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>Surface-emitting [SE] lasers, e.g. having both horizontal and vertical cavities</text></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-source">Group <class-ref scheme="cpc">H01S5/18</class-ref> is impacted by reclassification into group <class-ref scheme="cpc">H01S5/185</class-ref>.<br/>Groups <class-ref scheme="cpc">H01S5/18</class-ref> and <class-ref scheme="cpc">H01S5/185</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/183" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/183</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>having only vertical cavities, e.g. vertical cavity surface-emitting lasers [VCSEL]</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/18302" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18302</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising an integrated optical modulator</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/18305" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18305</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with emission through the substrate, i.e. bottom emission</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/18308" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18308</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having a special structure for lateral current or light confinement</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18311" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18311</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using selective oxidation</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S5/18313" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18313</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by oxidizing at least one of the DBR layers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18316" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18316</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Airgap confined</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18319" definition-exists="true" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/18319</classification-symbol><class-title date-revised="2021-01-01"><title-part><CPC-specific-text><text>comprising a periodical structure in lateral directions</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18322" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18322</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Position of the structure</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S5/18325" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18325</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Between active layer and substrate</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S5/18327" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18327</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Structure being part of a DBR </text><reference><text><class-ref scheme="cpc">H01S5/18391</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S5/1833" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1833</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with more than one structure</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H01S5/18333" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18333</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>only above the active layer</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="14" additional-only="false" sort-key="H01S5/18336" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18336</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>only below the active layer</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18338" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18338</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Non-circular shape of the structure</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/18341" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18341</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Intra-cavity contacts</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/18344" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18344</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterized by the mesa, e.g. dimensions or shape of the mesa</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18347" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18347</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Mesa comprising active layer</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/1835" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1835</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Non-circular mesa</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18352" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18352</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Mesa with inclined sidewall</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/18355" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18355</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having a defined polarisation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/18358" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18358</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing spacer layers to adjust the phase of the light wave in the cavity</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/18361" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18361</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Structure of the reflectors, e.g. hybrid mirrors</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18363" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18363</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising air layers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S5/18366" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18366</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Membrane DBR, i.e. a movable DBR on top of the VCSEL</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18369" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18369</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on dielectric materials</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S5/18372" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18372</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by native oxidation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18375" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18375</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on metal reflectors</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18377" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18377</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising layers of different kind of materials, e.g. combinations of semiconducting with dielectric or metallic layers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/1838" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/1838</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Reflector bonded by wafer fusion or by an intermediate compound</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/18383" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18383</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with periodic active regions at nodes or maxima of light intensity</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/18386" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18386</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Details of the emission surface for influencing the near- or far-field, e.g. a grating on the surface</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18388" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18388</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Lenses</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18391" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18391</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Aperiodic structuring to influence the near- or far-field distribution</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/18394" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18394</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Apertures, e.g. defined by the shape of the upper electrode</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/18397" definition-exists="false" ipc-concordant="H01S5/183" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/18397</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Plurality of active layers vertically stacked in a cavity for multi-wavelength emission</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/185" definition-exists="false" ipc-concordant="H01S5/185" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/185</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>having only horizontal cavities, e.g. horizontal cavity surface-emitting lasers [HCSEL] </text><reference><text>comprising a photonic bandgap structure <class-ref scheme="cpc">H01S5/11</class-ref></text></reference></title-part></class-title><notes-and-warnings><note type="warning"><note-paragraph warning-type="reclass-destination">Group <class-ref scheme="cpc">H01S5/185</class-ref> is incomplete pending reclassification of documents from group <class-ref scheme="cpc">H01S5/18</class-ref>. <br/>Groups <class-ref scheme="cpc">H01S5/18</class-ref> and <class-ref scheme="cpc">H01S5/185</class-ref> should be considered in order to perform a complete search.</note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/187" definition-exists="true" ipc-concordant="H01S5/187" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/187</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>using Bragg reflection</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S5/20" definition-exists="true" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-08-01" status="published"><classification-symbol>H01S5/20</classification-symbol><class-title date-revised="2019-08-01"><title-part><text>Structure or shape of the semiconductor body to guide the optical wave </text><CPC-specific-text><text>; Confining structures perpendicular to the optical axis, e.g. index or gain guiding, stripe geometry, broad area lasers, gain tailoring, transverse or lateral reflectors, special cladding structures, MQW barrier reflection layers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/2004" definition-exists="true" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Confining in the direction perpendicular to the layer structure</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/2009" definition-exists="true" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-08-01" status="published"><classification-symbol>H01S5/2009</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>by using electron barrier layers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2013" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2013</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>MQW barrier reflection layers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/2018" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2018</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Optical confinement, e.g. absorbing-, reflecting- or waveguide-layers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2022" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2022</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Absorbing region or layer parallel to the active layer, e.g. to influence transverse modes</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2027" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2027</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Reflecting region or layer, parallel to the active layer, e.g. to modify propagation of the mode in the laser or to influence transverse modes</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2031" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-02-01" status="published"><classification-symbol>H01S5/2031</classification-symbol><class-title date-revised="2018-02-01"><title-part><CPC-specific-text><text>characterized by special waveguide layers, e.g. asymmetric waveguide layers or defined bandgap discontinuities</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/2036" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-08-01" status="published"><classification-symbol>H01S5/2036</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>Broad area lasers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/204" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/204</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Strongly index guided structures</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/2045" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>employing free standing waveguides or air gap confinement</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/205" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Antiguided structures</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/2054" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2054</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Methods of obtaining the confinement</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/2059" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2059</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by means of particular conductivity zones, e.g. obtained by particle bombardment or diffusion</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2063" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>obtained by particle bombardment</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2068" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>obtained by radiation treatment or annealing</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2072" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2072</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>obtained by vacancy induced diffusion</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/2077" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2077</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using lateral bandgap control during growth, e.g. selective growth, mask induced</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/2081" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using special etching techniques</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2086" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>lateral etch control, e.g. mask induced</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/209" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/209</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>special etch stop layers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/2095" definition-exists="false" ipc-concordant="H01S5/20" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2095</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using melting or mass transport</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/22" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/22</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>having a ridge or stripe structure</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/2201" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2201</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in a specific crystallographic orientation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/2202" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2202</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by making a groove in the upper laser structure</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/2203" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2203</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a transverse junction stripe [TJS] structure</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/2205" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising special burying or current confinement layers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2206" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2206</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on III-V materials</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/2207" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2207</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>GaAsP based</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/2209" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2209</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>GaInP based</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/221" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/221</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing aluminium</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2211" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2211</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on II-VI materials</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2213" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2213</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on polyimide or resin</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2214" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2214</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on oxides or nitrides</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/2215" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2215</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using native oxidation of semiconductor layers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/2216" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2216</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>nitrides</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2218" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2218</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having special optical properties</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/2219" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2219</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>absorbing</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/222" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/222</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having a refractive index lower than that of the cladding layers or outer guiding layers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2222" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2222</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having special electric properties</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/2223" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2223</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>hetero barrier blocking layers, e.g. P-P or N-N</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/2224" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2224</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>semi-insulating semiconductors</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/2226" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2226</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>semiconductors with a specific doping</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/2227" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2227</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>special thin layer sequence</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S5/2228" definition-exists="false" ipc-concordant="H01S5/22" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2228</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>quantum wells</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/223" definition-exists="true" ipc-concordant="H01S5/223" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/223</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Buried stripe structure </text><CPC-specific-text><reference><text><class-ref scheme="cpc">H01S5/227</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2231" definition-exists="false" ipc-concordant="H01S5/223" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2231</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with inner confining structure only between the active layer and the upper electrode</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2232" definition-exists="false" ipc-concordant="H01S5/223" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2232</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with inner confining structure between the active layer and the lower electrode</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/2234" definition-exists="false" ipc-concordant="H01S5/223" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2234</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having a structured substrate surface</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S5/2235" definition-exists="false" ipc-concordant="H01S5/223" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2235</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a protrusion</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2237" definition-exists="false" ipc-concordant="H01S5/223" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2237</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a non-planar active layer</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2238" definition-exists="true" ipc-concordant="H01S5/223" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2238</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a terraced structure</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/227" definition-exists="false" ipc-concordant="H01S5/227" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S5/227</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>Buried mesa structure </text><CPC-specific-text><text>; Striped active layer</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2272" definition-exists="false" ipc-concordant="H01S5/227" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2272</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>grown by a mask induced selective growth</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/2275" definition-exists="false" ipc-concordant="H01S5/227" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2275</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>mesa created by etching</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/2277" definition-exists="false" ipc-concordant="H01S5/227" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/2277</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>double channel planar buried heterostructure [DCPBH] laser</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/24" definition-exists="false" ipc-concordant="H01S5/24" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S5/24</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>having a grooved structure, e.g. V-grooved </text><CPC-specific-text><text>, crescent active layer in groove, VSIS laser</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S5/30" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/30</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Structure or shape of the active region</text></title-part><title-part><text>Materials used for the active region</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/3004" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3004</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>employing a field effect structure for inducing charge-carriers, e.g. FET</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3009" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3009</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>MIS or MOS conffigurations</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/3013" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-12-01" status="published"><classification-symbol>H01S5/3013</classification-symbol><class-title date-revised="2015-12-01"><title-part><CPC-specific-text><text>A<sub>III</sub>B<sub>V</sub> compounds</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/3018" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-12-01" status="published"><classification-symbol>H01S5/3018</classification-symbol><class-title date-revised="2015-12-01"><title-part><CPC-specific-text><text>A<sub>II</sub>B<sub>VI</sub> compounds</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/3022" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-12-01" status="published"><classification-symbol>H01S5/3022</classification-symbol><class-title date-revised="2015-12-01"><title-part><CPC-specific-text><text>A<sub>IV</sub>B<sub>VI</sub> compounds</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/3027" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3027</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>IV compounds</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3031" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3031</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Si</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3036" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3036</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>SiC</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/304" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/304</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>porous Si</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3045" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>diamond</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/305" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/305</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the doping materials used in the laser structure</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3054" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3054</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>p-doping</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3059" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3059</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in II-VI materials</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3063" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using Mg</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3068" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>deep levels</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3072" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3072</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Diffusion blocking layer, i.e. a special layer blocking diffusion of dopants</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3077" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3077</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>plane dependent doping</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3081" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using amphoteric doping</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3086" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3086</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>doping of the active layer</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/309" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S5/309</classification-symbol><class-title date-revised="2017-08-01"><title-part><CPC-specific-text><text>doping of barrier layers that confine charge carriers in the laser structure, e.g. the barriers in a quantum well structure </text><reference><text>barriers in quantum wells <u>per se</u> <class-ref scheme="cpc">H01S5/3407</class-ref></text></reference></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3095" definition-exists="false" ipc-concordant="H01S5/30" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3095</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Tunnel junction</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/32" definition-exists="true" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/32</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>comprising PN junctions, e.g. hetero- or double- heterostructures </text><reference><text><class-ref scheme="cpc">H01S5/34</class-ref>, <class-ref scheme="cpc">H01S5/36</class-ref> take precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3201" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3201</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>incorporating bulkstrain effects, e.g. strain compensation, strain related to polarisation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3202" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S5/3202</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>grown on specifically orientated substrates, or using orientation dependent growth</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/320225" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S5/320225</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>polar orientation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/32025" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S5/32025</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>non-polar orientation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/320275" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2020-08-01" status="published"><classification-symbol>H01S5/320275</classification-symbol><class-title date-revised="2019-08-01"><title-part><CPC-specific-text><text>semi-polar orientation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3203" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3203</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>on non-planar substrates to create thickness or compositional variations</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3205" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3205</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with an active layer having a graded composition in the growth direction</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3206" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3206</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>ordering or disordering the natural superlattice in ternary or quaternary materials</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3207" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3207</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>ordered active layer</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3209" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3209</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>disordered active layer</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/321" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/321</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having intermediate bandgap layers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3211" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3211</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by special cladding layers, e.g. details on band-discontinuities</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3213" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3213</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>asymmetric clading layers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3214" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3214</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising materials from other groups of the periodic system than the materials of the active layer, e.g. ZnSe claddings and GaAs active layer</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3215" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3215</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>graded composition cladding layers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3216" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3216</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>quantum well or superlattice cladding layers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3218" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3218</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specially strained cladding layers, other than for strain compensation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3219" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3219</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>explicitly Al-free cladding layers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/322" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/322</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>type-II junctions</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3222" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-12-01" status="published"><classification-symbol>H01S5/3222</classification-symbol><class-title date-revised="2015-12-01"><title-part><CPC-specific-text><text>in A<sub>IV</sub>B<sub>VI</sub> compounds, e.g. PbSSe-laser</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3223" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3223</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>IV compounds</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3224" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3224</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Si</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/3226" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3226</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>SiC</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/3227" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3227</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>porous Si</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3228" definition-exists="false" ipc-concordant="H01S5/32" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3228</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>diamond</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/323" definition-exists="false" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S5/323</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>in A<sub>III</sub>B<sub>V</sub> compounds, e.g. AlGaAs-laser, </text><CPC-specific-text><text>InP-based laser</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/32308" definition-exists="false" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/32308</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>emitting light at a wavelength less than 900 nm</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/32316" definition-exists="false" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/32316</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising only (Al)GaAs</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/32325" definition-exists="false" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/32325</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>red laser based on InGaP</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/32333" definition-exists="false" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/32333</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on InGaAsP</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/32341" definition-exists="false" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/32341</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>blue laser based on GaN or GaP</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3235" definition-exists="false" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3235</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>emitting light at a wavelength longer than 1000 nm, e.g. InP-based 1300 nm and 1500 nm lasers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/32358" definition-exists="true" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-02-01" status="published"><classification-symbol>H01S5/32358</classification-symbol><class-title date-revised="2018-02-01"><title-part><CPC-specific-text><text>containing very small amounts, usually less than 1%, of an additional III or V compound to decrease the bandgap strongly in a non-linear way by the bowing effect</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S5/32366" definition-exists="false" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/32366</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>(In)GaAs with small amount of N</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S5/32375" definition-exists="false" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/32375</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>In(As)N with small amount of P, or In(As)P with small amount of N</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="13" additional-only="false" sort-key="H01S5/32383" definition-exists="false" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H01S5/32383</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>small amount of Thallum (TI), e.g. GaTIP</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/32391" definition-exists="false" ipc-concordant="H01S5/323" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-08-01" status="published"><classification-symbol>H01S5/32391</classification-symbol><class-title date-revised="2016-08-01"><title-part><CPC-specific-text><text>based on In(Ga)(As)P</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/327" definition-exists="false" ipc-concordant="H01S5/327" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-12-01" status="published"><classification-symbol>H01S5/327</classification-symbol><class-title date-revised="2015-12-01"><title-part><text>in A<sub>II</sub>B<sub>VI</sub> compounds, e.g. ZnCdSe-laser</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/34" definition-exists="true" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2023-02-01" status="published"><classification-symbol>H01S5/34</classification-symbol><class-title date-revised="2023-02-01"><title-part><text>comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers </text><reference><text><class-ref scheme="cpc">H01S5/36</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3401" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3401</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having no PN junction, e.g. unipolar lasers, intersubband lasers, quantum cascade lasers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3402" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3402</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>intersubband lasers, e.g. transitions within the conduction or valence bands</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3403" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3403</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having a strained layer structure in which the strain performs a special function, e.g. general strain effects, strain versus polarisation</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3404" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3404</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>influencing the polarisation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3406" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3406</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>including strain compensation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3407" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3407</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by special barrier layers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3408" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3408</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by specially shaped wells, e.g. triangular</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3409" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3409</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>special GRINSCH structures</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/341" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-01-01" status="published"><classification-symbol>H01S5/341</classification-symbol><class-title date-revised="2017-01-01"><title-part><CPC-specific-text><text>Structures having reduced dimensionality, e.g. quantum wires</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3412" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3412</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>quantum box or quantum dash</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3413" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3413</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising partially disordered wells or barriers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3414" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3414</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>by vacancy induced interdiffusion</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3415" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3415</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing details related to carrier capture times into wells or barriers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3416" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3416</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>tunneling through barriers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3418" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3418</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using transitions from higher quantum levels</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3419" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3419</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>intersubband lasers, e.g. laser transitions within the conduction or valence bands in non unipolar structures</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/342" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/342</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>containing short period superlattices [SPS]</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3421" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3421</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>layer structure of quantum wells to influence the near/far field</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3422" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3422</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising type-II quantum wells or superlattices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3424" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3424</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising freestanding wells</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3425" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3425</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>comprising couples wells or superlattices</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3426" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-12-01" status="published"><classification-symbol>H01S5/3426</classification-symbol><class-title date-revised="2015-12-01"><title-part><CPC-specific-text><text>in A<sub>IV</sub>B<sub>VI</sub> compounds, e.g. PbSSe-laser</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3427" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3427</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in IV compounds</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/3428" definition-exists="false" ipc-concordant="H01S5/34" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3428</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>layer orientation perpendicular to the substrate</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/343" definition-exists="true" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2017-08-01" status="published"><classification-symbol>H01S5/343</classification-symbol><class-title date-revised="2017-08-01"><title-part><text>in A<sub>III</sub>B<sub>V</sub> compounds, e.g. AlGaAs-laser </text><CPC-specific-text><text>, InP-based laser</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/34306" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/34306</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>emitting light at a wavelength longer than 1000nm, e.g. InP based 1300 and 1500nm lasers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/34313" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/34313</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a well layer having only As as V-compound, e.g. AlGaAs, InGaAs</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/3432" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3432</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the whole junction comprising only (AI)GaAs</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/34326" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/34326</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a well layer based on InGa(Al)P, e.g. red laser</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/34333" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/34333</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a well layer based on Ga(In)N or Ga(In)P, e.g. blue laser</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/3434" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3434</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with a well layer comprising at least both As and P as V-compounds</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/34346" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/34346</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>characterised by the materials of the barrier layers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/34353" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/34353</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on (AI)GaAs</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/3436" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3436</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on InGa(Al)P</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/34366" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/34366</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on InGa(Al)AS</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/34373" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/34373</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on InGa(Al)AsP</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/3438" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/3438</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>based on In(Al)P</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/34386" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/34386</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>explicitly Al-free</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/34393" definition-exists="false" ipc-concordant="H01S5/343" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-12-01" status="published"><classification-symbol>H01S5/34393</classification-symbol><class-title date-revised="2015-12-01"><title-part><CPC-specific-text><text>not only based on A<sub>III</sub>B<sub>V</sub> compounds</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/347" definition-exists="false" ipc-concordant="H01S5/347" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2015-12-01" status="published"><classification-symbol>H01S5/347</classification-symbol><class-title date-revised="2015-12-01"><title-part><text>in A<sub>II</sub>B<sub>VI</sub> compounds, e.g. ZnCdSe- laser</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/36" definition-exists="true" ipc-concordant="H01S5/36" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2021-01-01" status="published"><classification-symbol>H01S5/36</classification-symbol><class-title date-revised="2021-01-01"><title-part><text>comprising organic materials</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S5/40" definition-exists="true" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2016-05-01" status="published"><classification-symbol>H01S5/40</classification-symbol><class-title date-revised="2016-05-01"><title-part><text>Arrangement of two or more semiconductor lasers, not provided for in groups <class-ref scheme="cpc">H01S5/02</class-ref>&#160;-&#160;<class-ref scheme="cpc">H01S5/30</class-ref> </text><reference><text><class-ref scheme="cpc">H01S5/50</class-ref> takes precedence</text></reference></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/4006" definition-exists="true" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4006</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Injection locking</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/4012" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4012</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Beam combining, e.g. by the use of fibres, gratings, polarisers, prisms</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/4018" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4018</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Lasers electrically in series</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/4025" definition-exists="true" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4025</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Array arrangements, e.g. constituted by discrete laser diodes or laser bar </text><reference><text><class-ref scheme="cpc">H01S5/42</class-ref> takes precedence</text></reference></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/4031" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4031</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Edge-emitting structures</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/4037" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4037</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with active layers in more than one orientation</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/4043" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4043</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with vertically stacked active layers</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="12" additional-only="false" sort-key="H01S5/405" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/405</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Two-dimensional arrays</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/4056" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4056</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>emitting light in more than one direction</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/4062" definition-exists="true" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4062</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with an external cavity or using internal filters, e.g. Talbot filters</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/4068" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4068</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>with lateral coupling by axially offset or by merging waveguides, e.g. Y-couplers</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/4075" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4075</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Beam steering</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/4081" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Near-or far field control</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/4087" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4087</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>emitting more than one wavelength</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/4093" definition-exists="false" ipc-concordant="H01S5/40" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/4093</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Red, green and blue [RGB] generated directly by laser action or by a combination of laser action with nonlinear frequency conversion</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/42" definition-exists="false" ipc-concordant="H01S5/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/42</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Arrays of surface emitting lasers</text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/423" definition-exists="false" ipc-concordant="H01S5/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/423</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>having a vertical cavity</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="11" additional-only="false" sort-key="H01S5/426" definition-exists="false" ipc-concordant="H01S5/42" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/426</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Vertically stacked cavities</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="8" additional-only="false" sort-key="H01S5/50" definition-exists="true" ipc-concordant="H01S5/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2019-01-01" status="published"><classification-symbol>H01S5/50</classification-symbol><class-title date-revised="2019-01-01"><title-part><text>Amplifier structures not provided for in groups <class-ref scheme="cpc">H01S5/02</class-ref> - <class-ref scheme="cpc">H01S5/30</class-ref></text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/5009" definition-exists="false" ipc-concordant="H01S5/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/5009</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the arrangement being polarisation-insensitive</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/5018" definition-exists="false" ipc-concordant="H01S5/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/5018</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>using two or more amplifiers or multiple passes through the same amplifier</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/5027" definition-exists="false" ipc-concordant="H01S5/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/5027</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Concatenated amplifiers, i.e. amplifiers in series or cascaded</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/5036" definition-exists="false" ipc-concordant="H01S5/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/5036</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the arrangement being polarisation-selective</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/5045" definition-exists="false" ipc-concordant="H01S5/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/5045</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>the arrangement having a frequency filtering function</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/5054" definition-exists="false" ipc-concordant="H01S5/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/5054</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>in which the wavelength is transformed by non-linear properties of the active medium, e.g. four wave mixing</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/5063" definition-exists="false" ipc-concordant="H01S5/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/5063</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>operating above threshold</text></CPC-specific-text></title-part></class-title>
<classification-item breakdown-code="false" not-allocatable="false" level="10" additional-only="false" sort-key="H01S5/5072" definition-exists="false" ipc-concordant="H01S5/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/5072</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Gain clamping, i.e. stabilisation by saturation using a further mode or frequency</text></CPC-specific-text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/5081" definition-exists="false" ipc-concordant="H01S5/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/5081</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>specifically standing wave amplifiers</text></CPC-specific-text></title-part></class-title></classification-item>
<classification-item breakdown-code="false" not-allocatable="false" level="9" additional-only="false" sort-key="H01S5/509" definition-exists="false" ipc-concordant="H01S5/50" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S5/509</classification-symbol><class-title date-revised="2013-01-01"><title-part><CPC-specific-text><text>Wavelength converting amplifier, e.g. signal gating with a second beam using gain saturation</text></CPC-specific-text></title-part></class-title></classification-item></classification-item></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="true" level="6" additional-only="true" sort-key="H01S301/00" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/00</classification-symbol>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H01S301/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Functional characteristics</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S301/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>ASE (amplified spontaneous emission), noise</text></title-part><title-part><text>Reduction thereof</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S301/03" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/03</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Suppression of nonlinear conversion, e.g. specific design to suppress for example stimulated brillouin scattering [SBS], mainly in optical fibres in combination with multimode pumping</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S301/04" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gain spectral shaping, flattening</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S301/06" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Gain non-linearity, distortion</text></title-part><title-part><text>Compensation thereof</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S301/08" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/08</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Generation of pulses with special temporal shape or frequency spectrum</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H01S301/085" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/085</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>solitons</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S301/14" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/14</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Semiconductor lasers with special structural design for lasing in a specific polarisation mode</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H01S301/145" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/145</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>TM polarisation</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S301/16" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/16</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Semiconductor lasers with special structural design to influence the modes, e.g. specific multimode</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H01S301/163" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/163</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Single longitudinal mode</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H01S301/166" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/166</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Single transverse or lateral mode</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S301/17" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/17</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Semiconductor lasers comprising special layers</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H01S301/173" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/173</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>The laser chip comprising special buffer layers, e.g. dislocation prevention or reduction</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H01S301/176" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/176</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Specific passivation layers on surfaces other than the emission facet</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S301/18" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/18</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Semiconductor lasers with special structural design for influencing the near- or far-field</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H01S301/185" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/185</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>for reduction of Astigmatism</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S301/20" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2018-02-01" status="published"><classification-symbol>H01S2301/20</classification-symbol><class-title date-revised="2018-02-01"><title-part><text>Lasers with a special output beam profile or cross-section, e.g. non-Gaussian</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H01S301/203" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/203</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>with at least one hole in the intensity distribution, e.g. annular or doughnut mode</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H01S301/206" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2301/206</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Top hat profile</text></title-part></class-title></classification-item></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H01S302/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2302/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Amplification / lasing wavelength</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> In group <class-ref scheme="cpc">H01S2302/00</class-ref> and separated therefrom by a + sign the wavelength in nanometers (nnnn) is indicated. </note-paragraph></note></notes-and-warnings>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S302/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2302/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>THz - lasers, i.e. lasers with emission in the wavelength range of typically 0.1 mm to 1 mm</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H01S303/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2303/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pumping wavelength</text></title-part></class-title><notes-and-warnings date-revised="2013-01-01"><note type="note"><note-paragraph> In group <class-ref scheme="cpc">H01S2303/00</class-ref> and separated therefrom by a + sign the wavelength in nanometers (nnnn) is indicated. </note-paragraph></note></notes-and-warnings></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="7" additional-only="true" sort-key="H01S304/00" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2304/00</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Special growth methods for semiconductor lasers</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S304/02" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2304/02</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>MBE</text></title-part></class-title>
<classification-item breakdown-code="true" not-allocatable="false" level="9" additional-only="true" sort-key="H01S304/025" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2304/025</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>MOMBE</text></title-part></class-title></classification-item></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S304/04" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2304/04</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>MOCVD or MOVPE</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S304/06" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2304/06</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>LPE</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S304/10" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2304/10</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>CBE</text></title-part></class-title></classification-item>
<classification-item breakdown-code="true" not-allocatable="false" level="8" additional-only="true" sort-key="H01S304/12" definition-exists="false" ipc-concordant="CPCONLY" c-set-base-allowed="false" c-set-subsequent-allowed="true" date-revised="2013-01-01" status="published"><classification-symbol>H01S2304/12</classification-symbol><class-title date-revised="2013-01-01"><title-part><text>Pendeo epitaxial lateral overgrowth [ELOG], e.g. for growing GaN based blue laser diodes</text></title-part></class-title></classification-item></classification-item></classification-item></classification-item></class-scheme>