简介：在LD端面抽运的Nd：YVO4激光器中插入Cr^4＋：YAG晶体，获得了稳定的1．06μm波长的高重复率被动调Q脉冲激光输出。实验研究了抽运功率、腔长、输出镜透过率对输出功率的影响，以及不同抽运功率下脉冲重复频率和脉冲宽度的变化，并对结果进行了理论分析。当腔长为8cm，抽运功率为27W时，得到重复率37．8kHz、平均功率3．5W的调Q脉冲序列；单个脉冲能量为93μJ、脉宽为24ns、峰值功率为3．9kW。

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简介：ACe3+tion-dopedα-NaYF4singlecrystalofhighqualityisgrownsuccessfullybyanimprovedfluxBridgmanmethodundertheconditionsoftakingthechemicalrawcompositionofNaF:KF:YF3:CeF3inthemolarratioof30∶18∶48∶4,wheretheKFisshowntobeaneffectiveassistantflux.Thexraydiffraction,absorptionspectra,excitationspectra,andemissionspectraoftheCe3+t-dopedα-NaYF4singlecrystalaremeasuredtoinvestigatethephaseandopticalpropertiesofthesinglecrystals.TheabsorptionspectrumoftheCe3+t:α-NaYF4showsastrongbandthatpeaksatthewavelengthof300nm.TheemissionspectrumoftheCe3+t:α-NaYF4emitsanintenseultraviolet（UV）bandatthewavelengthof332nmundertheexcitationof300nmlight.Twoseparatedluminousbandsof330and350nm,whichcorrespondtothetransitions5d→2F25∕2and5d→F7∕2,canbeobtainedbyGaussfitting.ThestrongemissionintensityattheUVbandandtheexcellentopticaltransmissionintherangeofUVwavelengthsindicatethatCe3+t:α-NaYF4singlecrystalscanbeconsideredasapromisingmaterialforUVlasers.

简介：研究了SOFRADIR288×4红外探测器的结构与工作原理,在此基础上提出了基于外同步的288×4红外传感器的设计方案,并着重分析了其成像电路的设计,对其中的奇偶校正电路、非均匀性校正电路进行了详细的探讨和研究.

简介：TheCa_2SiO_4:Dy~(3+)phosphorwassynthesizedbythehightemperaturesolid-statereactionmethodinair.TheemissionspectrumofCa_2SiO_4:Dy~(3+)phosphorshowsseveralbandsat486,575,and665nmunderthe365-nmexcitation.TheeffectsofLi~+,Na~+,andK~+ontheemissionspectrumofCa_2SiO_4:Dy~(3+)phosphorwerestudied,TheresultsshowthattheemissionspectrumintensityisgreatlyinfluencedbyLi~+,Na~+,andK~+.Thechargecompensationconcentrationcorrespondingtothemaximumemissionintensityisdifferentwithdifferentchargecompensations.

简介：Diode-pumpedpassivelyQ-switchedNd:GdVO4/Cr4+:YAGlaserswithasimpleflat-flatcavityweredemonstrated.Themaximumaverageoutputpowerat1.06μmwas1.25W.Thehighestpeakpowerandpulseenergywere7.56kWand75μJ,respectively,withthepulserepetitionrateof11.1kHzandpulsewidthof10nsattheincidentpumppowerof8W.

简介：Ahigh-repetition-rateeye-safeopticalparametricoscillator(OPO),usinganon-criticallyphase-matchedKTPcrystalintracavitypumpedbyapassivelyQ-switchedNd:GdVO_4/Cr~(4+):YAGlaser,isexperimentallydemonstrated.Theconversionefficiencyfortheaveragepoweris7%frompumpdiodeinputtoOPOsignaloutputandtheslopeefficiencyisupto10.3%.Withanincidentpumppowerof7.3W,thecompactintracavityOPO(IOPO)cavity,operatingat15kHz,producesanaveragepowerof0.57Wat1570nmwithapulsewidthasshortas6ns.Thepeakpowerat1570nmishigherthan6.3kW.

简介：Weexperimentallydemonstratea4-Gb/sradio-over-fiber(RoF)systemwith40-kmfiberand2-mwirelessdistancedownstreamat100-GHzcarrier.Tothebestofourknowledge,thisisforthefirsttimeinChinatorealizeopticalwirelesslinkat100GHz.Inthisletter,simpleintensitymodulatorwithdirectdetector(IM-DD)modulationisemployedandopticalpowerpenaltyafter40-kmsinglemodefiber(SMF)-28and2-mairlinkis3.2dBwithbit-error-rate(BER)at1×109.

简介：Ultrashortpulsesweregeneratedinpassivelymode-lockedNd:YAGandNd:GdVO4laserspumpedbyapulsedlaserdiodewith10-Hzrepetitionrate.Stablemode-lockedpulsetrainswereproducedwiththepulsewidthof10ps.Theevolutionofthemode-lockedpulsewasobservedintheexperimentandwasdiscussedindetail.ComparingthepulseevolutionsofNd:YAGandNd:GdVO4lasers,wefoundthatthebuilduptimeofthesteady-statemode-lockingwithsemiconductorsaturableabsorbermirrors(SESAMs)wasrelevanttotheupper-statelifetimeandtheemissioncross-sectionofthegainmedium.

简介：Adiode-end-pumpedelectro-optic(EO)Q-switchedNd:YVO4laseroperatingatrepetitionrateof10kpps(pulsespersecond)wasreported.AblockofLa3Ga5SiO14(LGS)singlecrystalwasusedasaQ-switchandthedriverwasametaloxidesemiconductorfieldeffecttransistor(MOS-FET)pulserofhighrepetitionrateandhighvoltage.Atcontinuouswave(CW)operation,theslopeefficiencyofthelaserwas46%,andmaximumoptical-to-opticalefficiencywas38.5%.Usinganoutputcouplerwithtransmissionof70%,a10-kppsQ-switchedpulsetrainwith0.4-mJmonopulseenergyand8.2-nspulsewidthwasachieved,theopticalconversionefficiencywasaround15%,andthebeamqualityM2factorwaslessthan1.2.