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1、第18卷第4期强激光与粒子束Vol.18,No.42006年4月HIGHPOWERLASERANDPARTICLEBEAMSApr.,2006ArticleID:1001-4322(2006)04-0553-063+:YAGslablaserandTemperatureeffectofYbdiamondwindowcoolingdesign*1,2,YUHai-wu2,ZHENGWan-guo2,HEShao-bo2,WANGXiao-feng1CAODing-xiang(1.NationalUniversi
2、tyofDefenceTechnology,Changsha410073,China;2.ResearchCenterofLaserFusion,CAEP,P.O.Box919-988,Mianyang621900,China)3+:YAGslablaserhavebeeninvestigatedAbstract:Thetemperature-relatedlaserperformancesoftheYbbasedonquasi-threelevelrateequationmodel,whichinclude
3、theenergystorageandextractionefficiency.Theresultsshowthattheextractableenergystorageefficiencydecreasessignificantlyfrom43%to26%withthein-creaseofthetemperatureinthelasingslabfrom300to400K.Wealsohavedemonstratedthefeasibilityofdouble-facecoolingoflasingsla
4、bwithadiamondwindowwhosethermalconductivityissohighthataverythinplatesufficestoefficientlyremovetheheatgeneratedinthelasingslab.Simulationresultsshowthatwitha2pumpintensityof15kW/cmandrepetitionrateof10Hz,tokeepthemaximumtemperatureofthelasingslabbelowareas
5、onablevalue,e.g.,lessthan320K,theheatexchangecoefficientofwatershouldnotbelessthan2·K).Theresultsalsoshowthatunderthesamecoolingconditionreducingthethicknessofthe2000W/(mlasingslabandsimultaneouslyincreasingthenumberofpumppassescaneffectivelyreducethetemper
6、atureoflasingslab.Keywords:Quasi-threelevelsolidstatelaser;Highpower;Temperaturedependence;Heatextrac-tion;Diamondwindow;Diode-pumpedCLCnumber:TN248.1Documentcode:A3+:Withtheimprovementofhighpowerlaserdiodes,thequasi-threelevelsolidstatelasermediumYb[1-2]YA
7、Ghasattractedworldwideinterestbecauseofitsseveraladvantages.Firstly,ithasaverylowpump3+:YAGresultsinlessheatgenerationbyafactorof3thantheNd3+:YAG.defect.Forexample,theYb3+:YAGhasanupperstatelifetimeabout1ms,whichissuitableforlaserdiodepumping.Secondly,theYb
8、3+:YAGhasabroad-bandofabsorptionabout18nm(FWHM),andthusthecoolingofla-Thirdly,theYbserdiodesdoesnotneedtobecontrolledaccurately,whichisimportantforhighpowerdiodepumpsolidstate3+22laser(DPSSL).Finally,Y
