100khz声光调qndgdvo4激光器的研究

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1、AbstractLaser-diodepumpedsolid-statelaser(DPSSL)hasdevelopedquicklyathomeandabroadrecentyearsduetoitsadvantagesofcompactness,goodstabilization,highefficiencyandlonglifetime.ItisanavailablemeasuretoachieveshortpulsewidthandhighpeakpowerbyQ-switchedDPSSL,whichhaswideapplicationsinlaserrang

2、ing,lidar,remotesensing,machiningandsoon.Nd:GdVO4hasbeenrealizedandusedgraduallyduetoitshigherthermalconductivity,largerstimulatedemissioncrosssectionandabsorptioncrosssection,moderateup-levellifetimeandpolarizedoutput.Whatismore,itcanretainashortpulsewidthandhighpeakpowerevenatveryhighr

3、epetitionrates.Accordingtotheclassicalfour-levelrateequation,laseroutputpowerandslopeefficiencyatthresholdpumpingandhighpowerpumpingarededuced,theinfluenceofthedistributionofpumplightandoscillationlight,alsodeducedthepeakpower,laserpulseenergyandpulsewidthfortheQswitchlaserAtthecondition

4、ofbestmatchingpumpwavelengthandcrystalabsorbedwavelength,theoptic・opticconversionefficiencyoflaserisincreasing.Atthesametime,theinfluenceofcavitylengthandoutputtransmissiononlaseroutputpowerisresearched・Underbestmatching,anoutputpowerof7.3Wat1063nm,opticopticefficiencyof50.3%andslopeeff

5、iciencyof58.5%arcobtainedatthepumppowerof14.5WbymeansofLDsingle-endpumpedNd:GdVO4.Thethermallensfocusofthecrystalismeasuredbymeansofcriticalthermalstabilizedcavity.Thefunctionofoscillatedlightspotinthemiddleofthecrystalandpumpedpowerisbuiltaccordingtothermallensfocus.Underthematchingosci

6、llatedlightspotandpumpedlightspot,theperformanceoffundamentalmodeoutputinplane-planecavity,concave-planecavityandconvex-planecavity,respectively,aresimulatedandanalyzed・Itisthereforeconcludethatmodematchingcanbeimprovedbychangingcavitylength;therangeofmodematchingcanbeincreasedbydecreasi

7、ngthethermaleffectofcrystal;stabilityrangeofpumppowercanbeincreasedandhighfundamentalmodeoutputpowercanbeobtainedbymeansofcompensationtothermaleffectinconvex-planecavity.Acousto・opticQ-switchingtheoryisintroduced.Theeffectsofcavitylength,pumpedpowerandoutputtransmissionon