Efficient cw performance of a CoMgF2 laser operating at 1.5–2.0 μm

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1、Volume59,number2OPTICSCOMMUNICATIONS15August1986EFFICIENTCWPERFORMANCEOFACo:MgF~LASEROPERATINGAT1.5-2.0~mA.M.FOX,A.C.MACIELandJ.F.RYANClarendonLaboratoo,,UniversityofO_~ford,OxJord,U.K.Received1April1986WereporthighlyefficientcwperformanceofaCo:MgF2lase

2、roperatingoverthewavelengthrange1.5/~mto2.0/tin.Thisisaninherentlylow-gainlaserbutitisneverthelessanimportantcandidateasausefulsourcefor1.55Ftm.WehavebeensuccessfulingrowinghighqualitycrystalsofMgF2witharelativelyhighCo2÷concentration(~4%)whichhasenable

3、dustoobtainupto31%energyconversionfromacwNd:YAGpumplaseroperatingTEMooat1.3/tm.Weobtain330mWat1.55#musing1.4%outputcoupling,and1Wat1.86#musing3.6%outputcoupling.Laseroperationonthevibronicsidebandsofthegradationofcobaltconcentrationfrom2.9%to4.1%aT2~4T!

4、transitionofCo:MgF2crystalsunderflash-overitslength.Acrystalmeasuring13×8×5.1mmlampexcitationwasdemonstratedintheearlyyearsandhavinganaverageconcentrationof3.5%wascutoflaserdevelopmentbyJohnsonetal.[1].Thisworkfromthebouleandfaceswerepolishedat57°totheh

5、asbeenextendedinrecentyearsbyMoultonandc-axis.Therapidfalloffinthe4T2excitedstatelife-coworkerswhohavepresentedresultsforlasertimewithtemperatureabove100Kmakesliquidni-pumpedcrystalsunderavarietyofoperatingcondi-trogencoolingnecessaryforefficientcwperfo

6、rmance.tions.TunablecwTEMoooutputwasobtainedbe-Thecrystalwasthereforemountedinanopticaltween1.63/tmand2.08/tmfroma0.9%Co:MgF2cryostatingoodthermalcontactwiththecoldfingercrystalcooledto80Kandmountedinathreemirrorat80K.ThecrystalwasmountedatBrewster'sang

7、leastigmaticallycompensatedcavity[2].Themaxi-inanastigmatically-compensatedfolding-mirrormumpoweroutputachievedwasjustunder100mWcavitysimilartothatusedinstandingwavedyelas-at1.84#m,correspondingto5%powerefficiencyers[6]andcolor-centrelasers[7].Thecavity

8、design(powerout/powerin).Higherefficiencieswereisshowninfig.1.Thecrystalthicknessof5.1mmachievedforpulse-pumpedandQ-switchedopera-waschosentomatchthefoldingangleofthecavitytion[3,4].Recently28%powerefficientlyhasbeen(20--34°)foro