简介：WeinvestigatereactivefluorineatomspectroscopiccharacterizationinatmosphericpressureofHe/SF6plasmausingatomicemissionspectrometry.Asinputradiofrequency(RF)powerlevelsareraisedfrom140to220W,theemissionspectraof685.60(3p4D→3s4Ptransition)and739.87nm(3p4P→3s4Ptransition)increasesignificantly.Moreover,anoptimalvalueofSF6volumeconcentrationintheproductionoffluorineradicals,whichis0.8%isachieved.AdditionofcertainamountsofO2intoHe/SF6plasmaresultsinthepromotionofSF6dissociation.EmissionintensitiesoffluorineatomsshowthemaximumattheO2/SF6ratioof0.4.

简介：宽波段红外成像技术可以获取丰富的波段信息,在目标识别和频谱分析中具有独特的优势。设计了一种1.3-5μm宽波段短中波红外光学系统,该光学系统采用二次成像设计,包括7块透镜和2片反射镜,其中使用了2片硅非球面和1片硒化锌基底衍射面用以校正像差和色差。利用光学设计软件给出了系统的光学参数和二维外形结构图,并且对其像质和冷反射进行了系统分析。该系统可以实现在工作波段1.3-5μm宽波段中成像,其F数为2,满足100%冷光阑效率。该系统结构紧凑,像质较好,能够实现宽波段成像要求。

简介：对激光辐照PV型的Hg1-xCdxTe单元探测器的响应特性进行了研究,建立了材料内部光生电动势变化的数学分析模型。计算了不同光源辐照3类组分不同的Hg1-xCdxTe探测单元的输出特性,并对温度波动影响进行了分析。结果表明：在光敏面积恒定时,x值越大探测器的完全饱和电压越大,即探测器的响应度Hg0.627Cd0.373Te〉Hg0.698Cd0.302Te〉Hg0.819Cd0.181Te;x值越小,探测器受温度波动的影响越小。

简介：Wereportthefabricationofsubmicrometerpitsarray(SP-array)on6H-SiCsurfacebytheinterferenceoftwofemtosecondlaserbeams.FormationmechanismsandopticalabsorptionofSP-arrayarestudied.Therelativereflectivityandtransmissivityofwhitelightdecreaseto10%ofthevaluesofSiCcrystal,andtheopticalabsorptionisenhancedto97%.Therelativereflectivityandtransmissivityofincidentangleswithintherangeof20°-60°arekeptbelow25%.TheenhancementmechanismofopticalabsorptionoftheSP-arrayisalsodiscussed.

简介：Morethan6Waveragepowerultravioletradiationat355nmwasgeneratedinLiB3O5(LBO)crystalthroughthefrequencymixingofthefundamentalandsecondharmonicradiationofaNd:YAGlaser.Thisperformancewasachievedwith38%optical-to-opticalconversionefficiency(532nmto355nm).

简介：Wereportonthecontinuous-wave（CW）andpassiveQ-switchingperformanceofaminiatureYb:Y3Ga5O12crystallaserendpumpedbya935-nmdiodelaser.AmaximumCWoutputpowerof12.03Wisproducedwithanoptical-to-opticalefficiencyof54.4%,whiletheslopeefficiencyis63%.InthepassivelyQ-switchedoperationachievedwithaCr4+:YAGsaturableabsorber,anaverageoutputpowerof2.12Wat1025.2nmisgeneratedwithaslopeefficiencyof46%atapulserepetitionrateof5.0kHz.Thepulse’senergy,duration,andpeakpowerare424μJ,2.3ns,and184.3kW,respectively.

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.