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:025827025(2005)0220149204,,,(,100081),,,(LD),2183W,1120W1064nm,4714%;;;;TN248.1ALaserDiodePumpedHigh2Slope2EfficiencyMonolithicUnidirectionalSingleFrequencyRingLaserWANGXin,YANGSu2hui,SUNWen2feng,ZHAOChang2ming(DepartmentofPhotoelectricEngineering,BeijingInstituteofTechnology,Beijing100081,China)AbstractThecrystalsizeandthereflectivityofSandPpolarizationcomponentsoftheoutputcoupling(RSandRP)arecrucialfortheoperationofthemonolithicsinglefrequencyringlaser.TheworkingprincipleofsinglefrequencyoperationofthemonolithicringlaserwasdiscussedbymeansofJonesmatrix.Inordertoachievehighsinglefrequencyoutputpowerandhighslopeefficiency,RSandRPweredeterminedbycalculatingthesquareeigenvaluesandthedifferencesofsquareeigenvaluesofJonesmatrixoftheresonatoraswellasconsideringtheoptimumoutputcouplingforgivencrystalsize,magneticfieldandpumpingpower.Afibercoupleddiodelaserwasusedaspumpingsourceinexperiment.Singlefrequencyoutputpowerof1120Wwiththeslopeefficiencyof47.4%wasobtainedwheninputpumpingpowerwas2183W.Keywordslasertechnique;monolithicringlaser;highslopeefficiency;nonplanarringcavity;singlefrequency:2004203212;:2004206214:(51438020201):(1980),,,,E2mail:wangxinnnn@bit.edu.cn1KaneByer[1],Ar,0115W,2W,109mW,5%,(LD),1619mW,916%,3kHz/100ms,I.Freitag[2]41WLD,318W,2W,60%,,,Q,32220052CHINESEJOURNALOFLASERSVol.32,No.2February,2005400mW[3]2001600mW[4][5]21,H,A,,B,CD,,,,1Fig.1Monolithicnon2planarringcavity1(CCW)JCCW=rS00rPcos-sinsincos100-1cos1-sin1sin1cos1e-jB/200ejB/2cos2sin2-sin2cos2e-jC/200ejC/2cos2-sin2sin2cos2e-jD/200ejD/2cos1-sin1-sin1cos1cos-sinsincos=rS00rPjAjBjCjD,(1);i(i=B,C,D)S,P;1DABABC,CDA;2BCDABC,CDA;;rS,rPS,PS,PRS=r2S,RP=r2P,(CW)JCW=cossin-sincos100-1cos1-sin1sin1cos1e-jB/200ejB/2cos2-sin2sin2cos2e-jC/200ejC/2cos2sin2-sin2cos2e-jD/200ejD/2cos1sin1-sin1cos1cossin-sincosrS00rP=jAjBjCjDrS00rP(2)J(JCWJCCW)EJE=E,(3),1-2RS,RP1CCW=rSjA+rPjD2rSjA-rPjD22-4rSrP=1,3,CW=rSjA+rPjD2rSjA-rPjD22-4rSrP=2,4,(4)JCCWJCW,RSRP05132,1-2,,A.R.Clobes0101%[6],,,2RS,RPRS,RPCCW2-CW2-0101%;(1-2),32,13mm918mm4mm,0125T,12322242,1,12-320101%1212-32,RSRP[7],3(a)RS=0198,RP,3(b)RS=0198,1-12,1-3212-32-0101%RP;RS,RP,RS,,RS,RP,2LDFig.2StructureoftheLDpumpedmonolithicringlaser23W,Topt=G0l-(G0,lLD,),,G08133,1%;3(a)RS=0198,RP;(b)RS=0198,1-12,1-3212-32-0101%RPFig.3(a)2versusRPatRS=0.98;(b)1-12,1-32and12-32-0101%versusRPatRS=0.9801030105,,4,RS,RP,RS,RP,RS,RP,,RS=0197,RP=0181,RS=0198,RP=0185,01028043,Unique2ModeUM4000/100/20808nmLD6A,4W,115A100m,0122,LD2nm01318W,2183W,1120W1064nm,4714%(5)Burleigh2(F2P)1512:4RS=0196(a),0197(b),1-1212-32-0101%RPFig.41-12and12-32-0101%versusRPatRS=0.96(a),0.97(b),respectively5Fig.5Outputpowerversusinputpower15GHz,(Finesse)200,75MHz1120W,(6),,40Hz,1000(250s),(,),,SP=(3/-P)100%,(5);-P1000,(5)1%6Ch1:;Ch2:Fig.6MonolithiclaserspectrumCh1:drivingvoltageoftheF2P;Ch2:signalofthelaserspectrum4,SPCCW2-CW2-0.01%0,(1-2),RS,RP,1T.J.Kane,R.L.Byer.Monolithic,unidirectionalsingle2modeNdYAGringlaser[J].Opt.Lett.,1985,10(2):65672I.Freitag,A.Tunnermann,H.Welling.Powerscalingofdiode2pumpedmonolithicNdYAGlaserstooutputpowersofseveralwatts[J].Opt.Commun.,1995,115:5115153ZangErjun,CaoHongjun,ZhaoKunetal..Investigationofmonolithicquasi2planarringlasers[C].SPIE,1998,3549:29344WuKeying.LDpumpedunidirectionalnonplanarsingle2frequencyringlaser[D].Beijing:DepartmentofPhotoelectricEngineering,BeijingInstituteofTechnology,2001.55.LD[D].,2001.555YangSuhui,WuKeying,WeiGuanghui.Novelsingle2frequencydiodepumpedsolid2statelasersandtheirapplicationsinlaserrangingandvelocimetry[J].Chin.Phys.Lett.,2001,18(7):9069086A.R.Clobes,M.J.Brienza.Single2frequencytraveling2waveNdYAGlaser[J].Appl.Phys.Lett.,1972,21(6):2652677SunWenfeng,YangSuhui,LiLeietal..Studyonoptimumoutputcouplingofunidirectionalnon2planarringlaser[J].ChineseJ.Lasers,2004,31(Suppl.):471473,,.[J].,2004,31():47147325132