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1、1952OPTICSLETTERS/Vol.16,No.24/December15,1991Diode-pumpedcwbulkEr:Yb:glasslaserP.Laporta,S.DeSilvestri,V.Magni,and0.SveltoCentrodiElettronicaQuantisticaeStrumentazioneElettronicadelConsiglioNazionaledelleRicerche,IstitutodiFisicadelPolitecnico,PiazzaLeonardodaVinc
2、i32,20133Milano,ItalyReceivedJune25,1991Continuous-wavelaseroperationofbulkEr:Yb:phosphateglasspumpedat980nmbyanInGaAsindex-guideddiodelaserhasbeenachievedforthefirsttimetoourknowledge,with2mWofoutputpowerobtainedat1.54,um.Tooptimizepumpingconditionsandtoinvestigat
3、etheeffectsofpumpwavelength,theEr3+:Yb3+glassdiskhasalsobeenpumpedbyaTi:A1203laserat960and980nm,andweobtainedhighoutputpower(70mW)andthehighestslopeefficiency(21%for980-nmpumping)reportedtodateforabulkEr:glasslaser.LaseroscillatorsbasedonEr3"-dopedglassesandplanodi
4、skiscoatedforhighreflectivityat1.54,umfibershaverecentlybecomethesubjectofgreat(R=99.9%)andantireflectioncoatedat960-interest,'15inparticularfortheirpotentialusein980nm(R<6%).Theotherfaceishigh-opticalcommunicationsystemsoperatingnearreflectivitycoatedat960-980nm(R
5、=99.8%)and1.5,mandintelemetryataneye-safewavelength.antireflectioncoatedat1.54,m(R=4%o).TheInthisLetterwereportwhatistoourknowledgeresonatordesignisastandardplano-concavecon-thefirstsuccessfulcwlaseroperationofbulkfigurationconsistingofthehigh-reflectivitymirrorEr3
6、":Yb3":phosphateglasspumpedat980nmbyandirectlycoatedononefaceofthediskanda5-mmInGaAsindex-guidedstrained-layerdiodelaser.radius-of-curvature(ROC)outputsphericalmirror.Thelaserisalsopumpedat960and980nmbyaWitharesonatorlengthof3.5mmthewaist,whichTi:A1203lasertoshowit
7、spotentialforhighpoweroccursattheendfaceofthedisk,hasaspotsizeandhighefficiency.(half-widthl/e2ofintensity)of35Am,andtheErbiumisathree-levellasermediumat1.5,mmodespotsizeisalmostconstantinsidethedisk.andthusrequiresmorepopulationintheexcitedTheEr3+:Yb3+laserisendpu
8、mpedbyanInGaAsmetastablelevelthaninthefundamentalone.Thisstrainedsemiconductorlaser.Thelightemittedmayleadtoexcited-stateabsorptionofpumplight6by
