227-W output all-fiberized Tm-doped fiber laser at 1908 nm

《227-W output all-fiberized Tm-doped fiber laser at 1908 nm》由会员上传分享，免费在线阅读，更多相关内容在学术论文-天天文库。

1、Chin.Phys.BVol.23,No.10(2014)104206227-Woutputall-fiberizedTm-dopedfiberlaserat1908nmHuZhen-Yue(胡震岳),YanPing(闫平),XiaoQi-Rong(肖起榕),LiuQiang(柳强),andGongMa-Li(巩马理)†CenterforPhotonicsandElectronics,StateKeyLaboratoryofTribology,DepartmentofPrecisionInstruments,TsinghuaUniversity,Beijing100084,Ch

2、ina(Received12February2014;revisedmanuscriptreceived10March2014;publishedonline10August2014)Inthispaper,wereportthatadiode-pumpedthulium-dopeddoublecladsilicafiberlasercanprovidepowersofupto227Wat1908nm,correspondingtoaslopeefficiencyof54.3%,andanoptical-to-opticalefficiencyof51.2%.Theoutputp

3、ower,tothebestofourknowledge,isthehighestoutputat1908nm.ThebeamqualityM2factorisabout1.56.Alsodiscussedinthispaperisthedependenceofthelaserperformanceonfiberlength.Keywords:thulium-dopedfiberlaser,rateequations,1908nmPACS:42.55.Ah,42.55.Wd,42.60.MiDOI:10.1088/1674-1056/23/10/1042061.Introduc

4、tionefficiencyof54.3%,andanM2factorofabout1.56.Anditisthehighestoutputat1908nmuptonow.Thulium-dopedfiberlasers(TDFLs)producinghighout-Theoscillatorismorestableandlesssensitivetoexter-putpowerinthe2-mspectralregionhaveattractedmuchat-nalfeedbackfromreflectionsforthefibergratingsthanthatoftenti

5、onduetotheirnumerousapplicationsintheareassuchasmedicalimaging,lidar,spectroscopy,etc.[1–5]AndanotherMOPAsystem.Alsotheoscillatorisallfiberized,itismorecompactandsimple.importantusageofTDFLsisthepumpingsourceofHo:YAGsolidstatelaser.[6]Comparedwiththesolidstatelaserpump-ingsource,theTDFLhasa

6、betterbeamqualityandiseasyto2.Experimentalsetupandresultsoperate.[7]AsapumpingsourceofHo:YAG,theTDFLneedsTheexperimentalsetupfortheTDFLisshowninFig.1.tobetunedtoproduceanarrow1908-nmemissionpeak.ForSevenfiber-coupledLDswerecombinedintoonebeamletbycladding-pumpedTDFLoperatingbelowabout1.95m

7、,theusinga71combiner.EachoftheLDsgeneratedamaxout-signalreabsorptionlossisasignificantdesignconcernwhichputpowerof70Wwithacentralwavelengthof790nmcancreatechallengesfor1908-nmoperation,anditisoftenandfullwidthathalfmaximum(FWHM)of1.66nmasshownobservedasanins