简介：Anall-solid-statequasi-continuous-wavedispersioncavitytunableTi:sapphirelaserpumpedbyalaserdiodepumpedfrequency-doubledNd:YAGlaserisreported.Usingadenseflintglassprismasthedispersionelement,atuningrangefrom730to880nmwiththelinewidthof3nmandthepulsewidthof17.2nswasobtained.Themaximumoutput,powerofthislasersystemwas5.6Wat786.3nmcorrespondingtoanoptical-to-opticalconversionefficiencyof25.5%underthepumppowerof22W.

简介：A100-Gb/shigh-speedopticaltransmitterisproposedandexperimentallydemonstrated.Basedonfrequency-quadruplingtechnique,twosub-channelswithafixed50-GHzspacingareobtainedfromonelasersource.Usingreturn-to-zerodifferentialquadraturephase-shiftkeying(RZ-DQPSK)modulationformatandpolarizationmultiplexing(PolMux),onlylow-speedelectronicdevicesof12.5GHzareneededforthe100-Gb/stransmitter.Thiseliminatestheneedofultrahigh-speedoptoelectronicdevicesandthusgreatlyreducesthecost.Theexperimentalresultsshowthatthistransmittercanachievegoodperfor-manceindispersiontoleranceofa25-kmsinglemodefiber(SMF).

简介：Aversatileandlow-costsingle-beamself-referencedphase-sensitivesurfaceplasmonresonance(SPR)sens-ingsystemwithultra-highresolutionperformanceispresented.Thesystemexhibitsaroot-mean-squarephasefluctuationof±0.0028°overaperiodof45min,i.e.aresolutionof±5.2×10~(-9)refractiveindexunits.Theenhancedperformancehasbeenachievedthroughtheincorporationofthreedesignelements:atruesingle-beamconfigurationenablingcompleteself-referencingsothatonlythephasechangeassociatedwithSPRgetsdetected,adifferentialmeasurementschemetoeliminatespurioussignalsnotrelatedtothesensorresponse,andtheeliminationofretardationdriftsbyincorporatingtemperaturestabilizationintheliquidcrystalphasemodulator.Ourdesignshouldbringthedetectionsensitivityofnon-labelingSPRbiosensingclosertothatachievablebyconventionalfluorescence-basedtechniques.

简介：Wepresentanovelcoherenttransceiverforopticaldifferentialphase-shiftkeying/differentialquadraturephase-shiftkeying（DPSK/DQPSK）signalsbasedonheterodynedetectionandelectricaldelayinterferometer.Asimulationframeworkisprovidedtopredictatheoreticalsensitivitylevelforthereportedscheme.Highsensitivityof-45.18dBmisachievedfor2.5-Gb/sreturn-to-zero（RZ）-DPSKsignal,andhighsensitivitiesof-36.83dBm（Itributary）and-35.90dBm（Qtributary）areobservedfor2.5-GBaud/sRZ-DQPSKsignalinback-to-backconfiguration.Transmissionforbothsignalsover100kmisalsoinvestigated.Experimentalresultsarediscussedandanalyzed.

简介：一个新奇的黑磷(BP)答案可饱和的吸收器(SA)被liquid-phase-exfoliated方法制作并且成功地使用了为消极地切换Q(QS)Nd:YVO4激光。与传统的稳固的SA相比，BP答案SA拥有更优秀的光透明性和更高的损坏抵抗。最短的脉搏持续时间和最高平均的产量力量被测量分别地是119ns和1.23W。就我们的知识而言，他们俩是在QS之中的最好的结果固态有基于BP的吸收器的激光到目前为止。重复率在533.2～722kHz的范围。结果显示BP答案SA的潜在的申请进高力量固态脉搏激光。

简介：TransientthermalimpedanceofGaN-basedhigh-powerwhitelightemittingdiodes(LEDs)iscreatedusingathermaltransienttester.Anelectro-thermalsimulationshowsthatLEDjunctiontemperature(JT)risestoaverylowdegreeunderlowdutycyclepulsedcurrent.AtthesameJT,emissionpeaksareequivalentatpulsedandcontinuouscurrents.Moreover,thediferenceinpeakwavelengthwhenaLEDisdrivenbypulsedandcontinuouscurrentsinitiallydecreasesthenincreaseswithincreasingpulsewidth.Thus,selectinganappropriatepulsewidthdecreaseserrorsinJTmeasurement.

简介：Theeffectofλ/2SiO2overcoatonthelaserdamagecharacteristicsofHfO2/SiO2high-reflector(HR)coatingsisinvestigatedwith1-on-1andN-on-1laserdamagetestmethods.Thelaserdamagesurfaceof1-on-1isanalyzedbyastepanalyzer.ThesurfacemorphologiesshowthatlaserdamagemakesthecoatingdamagedareaprotrudentandroughforHRcoatingwithoutλ/2silicaovercoat,butconcaveandsmoothforHRcoatingwithλ/2silicaovercoat.Theresultof10-on-1multi-pulseirradiationonthesamepointofthecoatingshowsthatthereisanenergydensitystageonthedamagecurve.Ifthelaserenergydensityiswithintherangeofthestage,HfO2/SiO2HRcoatingswithλ/2silicaovercoatwillnotbedamagedmorethan2timesformulti-shots,andthesurfacedamagesareveryslightsothatthereisnoimpactonthecoatingperformance.Anotherinterestingresultisthattheenergydensitystageextendsfromthedamagethresholdtothepointofabout3timesofthreshold,whichissimilartotheeffectofthelaserconditiononcoating.

简介：Theoreticalanalysisoftheelectromagneticfielddistributioninthefocalregionofalongmetallicparabolicreflectorthathasitssurfacecoveredwithamagnetizedplasmalayerisderived.Theincidentwaveisconsideredtobewithageneralobliqueincidenceforbothparallelandperpendicularpolarizations.TheelectromagneticfieldintensityexpressionsalongthefocalregionareobtainedaccuratelyusingMaslov’smethod.Theeffectsofplasmathicknessonthereflectedandtransmittedfielddistributionsareinvestigated.Theeffectsofotherphysicalparameterssuchastheangleofincidenceandtheplasmaandcyclotronfrequenciesonthetransmittedfieldintensitydistributionalongthefocalregionarealsostudied.TheresultsobtainedbyMaslov’smethodandKirchhoff’sapproximationarefoundtobeinagoodagreement.

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

简介：Wedemonstrateadiode-pumpTm3+t-dopedall-fiberlaseroperatingat1908nmbasedonamasteroscillatorpoweramplifier（MOPA）configuration.Inourwork,152Woflaseroutputpowerisgeneratedbyatotalincidentpumppowerof434Wat790nm,correspondingtothetotalopticalefficiencyof35%.Thelaserwavelengthis1908.29nm.Tothebestofourknowledge,itisthehighestoutputpowerreachedaround1908nmwithsuchanarrowlinewidthof0.18nmbasedonaMOPAconfiguration.

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.