連續(xù)LD泵浦調Q技術研究.pdf

1、長春理工大學碩士學位論文連續(xù)LD泵浦調Q技術研究姓名：郭家喜申請學位級別：碩士專業(yè)：光學指導教師：金光勇20100301ABSTRACTInordertoobtainhio_hrepetitionrateandhighaverageoutputpowerpulsedlaserwiththetheoreticalandexperimentalmethods，thepassiveQ—swithingtechnologyofCWLD—pump

2、ediSstudiedusingCWhighpowerLDarraysaspumpsourceNd：YAGaslasergainingmediumandCra：YAGaspassiveQswitchingThespectralcharacter1evelstructureandpassivesaturableabsorptioncharacterofCr4：YAGcrystalareanalysisedandthecurveofCr4：

3、YAGtransmissivitywiththeopticalpowerdensityisabtainedbynumericalmethodsTherateequationsofpassivelyQswitchedlaserpumpedbyCWLDandtheexpressionsofthresholdpumpratethesingle—pulseenergypeakpowerandpulsewidtharegivenThecurveo

4、fsinglepulseenergypeakpowerandpulsewidthwiththeinitialtransmissionofCr4：YAGcrystalareachievedbynumericalmethodsThemodeparametersofGaussianbeamareanalysisedandcalculatedbasingonABCDmatrixtheoryTheparametersofCr4十：YAGcryst

5、alaredeterminedbasingonlasergainDesigningthering—directwatercooledstructureforCr4：YAGcrystalandtheCr珥十：YAGcrystaleasilyburstproblemunder也ehigh—powerCW—pumpingissolvedThevariationofaverageoutputpowerrepetitionrate，pulsewi

6、dth，lasingmodewithLDinjectioncurrentresonantcavitylengthCr4：YAG’SlocationincavityCr4：YAGinitialtransmissionarestudiedusingexperimentalmethodUsingpiano—pianesonator也einitialtransmissionof9152％ofCr：YAGcrystal，TEM00modeQswi

7、tchingpulsewithaverageoutputpowerof730W，pulsewidthof19630ns，repetitionrateof1896kHzareobtainedwhentheLDinjectioncurrentiSl3A，theopticaltoopticalconversionefficiencyiS49％andthedynamictOstaticratioisabout6697％Usingplanocon

8、vexresonatortheinitialtransmissionof8369％ofCr4：YAGcrystal，asinglepulseenergyof246mJaverageoutputpowerof1040Wpulsewidthof10100ns，repefitionrateof422kHzareobtainedwhentheLDinjectioncurrentisl2A，theopticalto—opticalconversi

9、onefficiencyis76％：usingtheinitialtransmissionof9152％ofCr肆十：YAGcrystalanaverageoutputpowerof1760W，pulsewidthof32900ns，repetitionrateof1417kHzareobtainedwhentheLDinjectioncurrentis12A，theopticaltoopticalconversionefficienc