简介：报道了波长可调谐增益开关中红外2．8μm脉冲光纤激光器。采用脉冲975nm半导体激光器泵浦高掺Er：ZBLAN双包层光纤，以闪耀光栅为谐振腔反馈元件，获得了波长可调谐增益开关中红外脉冲光纤激光输出。激光器工作频率为1～10kHz，波长调谐范围为2．703-2．819μm。在泵浦源重频10kHz条件下，激光器最大平均功率为110mw，最小脉宽为661．2ns，峰值功率为16．5W，斜率效率达28．6％。

简介：Wereportonacompactpassivemode-lockedEr:fiberringlaseroperatedatthefundamentalrepetitionrateof517MHz,whichwebelieveisthehighestfundamentalrepetitionrateeverreportedinaringcavityfiberlaser.Thekeytechniqueistheemploymentoftwoinnovativehigh-powerwavelengthdomainmultiplexercollimatorswithallgainfibercavitysuitedforthehighpower(upto2W)pumping.Thelaserisfeaturedwithadirectchirpfreeoutputpulse,whichis97fswithoutextracavitycompressionatanaverageoutputpowerof90mW.

简介：Multilayerblackphosphorus（BP）nanoplateletsofdifferentthicknesseswerepreparedbytheliquidphaseexfoliationmethodanddepositedontoyttriumaluminumgarnetsubstratestoformsaturableabsorbers（SAs）.Thesewerecharacterizedwithrespecttotheirthickness-dependentsaturableabsorptionpropertiesat3μm.TheBP-SAswereemployedinapassivelyQ-switchedEr:Lu2O3laserat2.84μm.ByusingBPexfoliatedindifferentsolvents,stablepulsesasshortas359nsweregeneratedatanaverageoutputpowerofupto755mW.Therepetitionrateintheexperimentwas107kHz,correspondingtoapulseenergyof7.1μJ.TheseresultsprovethatBP-SAshaveagreatpotentialforopticalmodulationinthemid-infraredrange.

简介：Inthispaper,weproposedawaytorealizeanEr-dopedrandomfiberlaser(RFL)withadisorderedfiberBragggrating(FBG)array,aswellastocontrolthelasingmodeoftheRFLbyheatingspecificlocationsofthedisorderedFBGarray.ThedisorderedFBGarrayperformsasboththegainmediumandrandomdistributedreflectors,whichtogetherwithatunablepointreflectorformtheRFL.Coherentmulti-moderandomlasingisobtainedwithathresholdofbetween7.5and10mWandapowerefficiencybetween23%and27%whenthereflectivityofthepointreflectorchangesfrom4%to50%.Tocontrolthelasingmodeofrandomemission,aspecificpointofthedisorderedFBGarrayisheatedsoastoshiftthewavelengthoftheFBG(s)atthispointawayfromtheotherFBGs.Thus,differentresonancecavitiesareformed,andthelasingmodecanbecontrolledbychangingthelocationoftheheatingpoint.

简介：Inthispaper,Er/Ybco-dopedfiberamplifiers(EYDFAs)withanYb-bandfiberBragggrating(FBG)atthepumpendtoimprovetheperformanceoftheamplifierissystematicallystudied.TheinfluenceofthereflectivityandcenterwavelengthoftheFBGalongwiththegain-fiberlengthontheperformanceofanEYDFAarenumericallyanalyzed.TheresultsshowthatthewavelengthoftheFBGhascriticalinfluenceontheefficiencyoftheEYDFA,whereastherequirementtoitsreflectivityisrelaxed.Itisaneffectiveandpromisingwaytoimprovetheefficiencyofahigh-powerpumpedEYDFAbyintroducingasuitableYb-bandFBGatthepumpend.Basedontheanalysisoftheunderlyingprinciples,suggestionsforthepracticaldesignandpossiblefurtherimprovementstrategiesarealsoproposed.

简介：Wedemonstratedstablemidinfrared(MIR)opticalfrequencycombatthe3.0μmregionwithdifferencefrequencygenerationpumpedbyahighpower,Er-doped,ultrashortpulsefiberlasersystem.Asolitonmode-locked161MHzhighrepetitionratefiberlaserusingasinglewallcarbonnanotubewasfabricated.TheoutputpulsewasamplifiedinanEr-dopedsinglemodefiberamplifier,anda1.1–2.2μmwidebandsupercontinuum(SC)withanaveragepowerof205mWwasgeneratedinhighlynonlinearfiber.ThespectrogramofthegeneratedSCwasexaminedbothexperimentallyandnumerically.ThegeneratedSCwasfocusedintoanonlinearcrystal,andstablegenerationofMIRcombaroundthe3μmwavelengthregionwasrealized.

简介：基于计算机串口通信和功率型金属氧化物半导体场效应晶体管，设计研制了程控产生单次快前沿负高压脉冲的信号发生器。其性能指标为高压脉冲幅度一100～-1000V，脉冲宽度40ns～2μs，脉冲前沿随脉冲幅度和宽度变化，可小于30ns，输出负载为50Ω作为一种模拟源，该高压脉冲信号发生器已用于小功率气体放电管的高压保护特性实验研究中。