1999 Theoretical modelling and experimental investigations of the diode-pumped thin-disk Yb YAG laser.pdf

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1、QuantumElectronics29(8)697^703(1999)ß1999KvantovayaElektronikaandTurpionLtdPACSnumbers:42.55.Rz;42.55.Sa;42.55.XiTheoreticalmodellingandexperimentalinvestigationsofthediode-pumpedthin-diskYb:YAGlaserKContag,MKarszewski,CStewen,AGiesen,HHu«gelAbstract.Thefundamentalprinciplesoftheope

2、rationofaingtheactiveelementwasreported[2].Thishasmadeitsolid-statelaserarepresentedforthecasewhentheactivepossibletousealsoquasi-three-levelactivemedia[3].Studieselementisathindisk.Ananalyticalmodelofthislaserishavealsobeenmadeofweakeningthethermallenseffectindeveloped.Themodelisus

3、edtocalculatetheinfluenceofslablasers.thevariousparametersontheoperationalefficiencyoftheAsregardsthebeamquality,however,theprincipallaser.Adetailedmodelisalsodevelopedforcalculationsadvantagesprovidedbydiodepumpingofsolidstatemedia,relatingtoaspecificlaserdesignandthismodeltakestha

4、tishighefficiencyandhighbeamquality,havenotyetaccountofthegeometryoftheactivemedium,ofthediodebeenfullyexploited.Fig.1showsthebeamqualityparameter2pumpconfiguration,andoftheoperatingconditions.M(thefactorbywhichthebeamdivergenceexceedstheExperimentsyieldedacwoutputpowerupto350Wanddi

5、ffractionlimit),asafunctionofthecwoutputpower.Inanopticalpumpingefficiencyof50%(thecorrespondingthecaseofCO2lasersthisparameterisclosetoone,whereasvaluesobtainedinthissingle-moderegimewereapproxi-diode-pumpedsolidstatelasersofferapotentialimprove-mately100Wand440%).Theseresultswere

6、obtainedmentofalmost2ordersofmagnitudeevenathighpowerbelow08Cforeightpassesofthepumpradiationthroughlevels.theactivemedium.Atroomtemperatureandfor16passesAhighbeamqualitycanbeobtainedbyappropriateres-thesameparameterswereseveraltensofwattsandaneffi-onatordesignandarigorousreductiono

7、fthethermaleffectsciencyupto58%.Theseexperimentalresultswereingoodinsidetheactivemedium.Thismeansthatthethermallensingagreementwiththepredictionsofthetheoreticalmodel.effectshavetobeavoidedorcontrolledinsuchawaythatnodetrimentaleffectswilloccur.Onepossibilityistoorientthe1.Lasersfor

8、materialprocessingh