全固态激光器热激发泵浦和综合泵浦技术.研究

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1、ABSTRACTInthisdissertation，wefirstlyinvestigatetheoutputperformancesofNd：YAGandNd：YV04laserunderthermallyboostedpumping／directpumpingcombinedwiththerateequationsoffour-levelsystem，usinganall-solid—statequasi—continuoustunableTi：Sapphirelaserastheirpumpsource．Thebettermodematchi

2、ngbetweenthepumpandoscillatingbeamwasobtainedbytheoptimizationoflasercavity,andthehigh．efficiency1．06一Ⅲnand1．3-lainoutputwereachieved．Comparativeresultsobtainedbytraditionalpumpingat808nm．Throughtheexperiments，werealizethatthe808．amtraditionalpumpingcanachievehighoptical-to—opt

3、icalefficiency,whileintroduceplentifulheatgeneration．Thethermallyboostedpumping／directpumpinghashigherslopeefficiencyandlowerheatgeneration，butwithloweroptical．．to．．opticalconversionefficiencyowingtothelowabsorptioncoefficiency．Basingontheexperimentresults，webringforwardanovelp

4、umpingschemenamedsyntheticalpumpingbycombiningtheadvantagesofthesetwopumpings．Tolookforwardtothebalancepointbetweentheweaknesses(plentifulheatgenerationandlowabsorptioncoefficient)oftwopumpingmethods，expectantly,syntheticalpumpingwilldecreaseheatgenerationgreatlywhilereducetheo

5、utputpowerslightly,whichisadvantageoustothelaseroperation，especiallyforthehighpowersolid。statelasers．Wemainlydosomeworkasfollows：1．Basingontherateequationsoffour-levelsystem，wededucetheoutputperformancesoflaserspumpedbythermallyboostedpumping／directpumping，besides，wecalculateth

6、eheatgenerationinlasermedium；2．Takingthethermaleffectsintoaccount，weobtainthebettermodematchingbetweenthepumpandoscillatingbeambyoptimizingthelasercavity；’‘3．Underdirectpumping，weresearchtheoutputperformancesof1064nmand1342nmof．Nd：YV04laserwithdifferentdopingconcentrations．When

7、theincidentpumppowerwas2．1Wwhiletheabsorbedpumppowerof1．7WjWegainedthe1．21Woutputof1064nm，withoptical-to-opticalconversionefficiencyof57．6％，thethresholdandtheslopeefficiencyinabsorbedpumppowerwas75．3％and200mW,respectively．Moreover,wemeasuredtheheatgenerationinthelasermediumunde

8、rdifferentpumpings．Whentheincidentpumppowerwas1．8Wwhil