简介：Toimprovethefrequencystabilizationoflaserdiodeinthelaserfrequencyscannedinterferometricmetrology,amodifiedmethodisproposedbyusingafiberringresonator.Thetheoreticalanalysisofthismodifiedmethodisperformed.Moreover,thePound-Drever-Hall(PDH)techniqueisemployedtoobtainthefrequencydiscriminationcurveofafiberringresonator,whosefinesseis1260andline-widthis270kHz.Thesimulatedresultsshowthatthecurvehasasteepslopeneartheresonantfrequency,whichprovesthesensitivityofthissystemtothefrequencydeviation,sothemodifiedmethodhasgreatpotentialforthefrequencystabilizationofalaserdiode.

简介：Spurredonbytheinventionofthebluelight-emittingdiode(LED)aquarterofacenturyago,theLEDindustryhasadvanceddramaticallyandhasrevolutionizedthesignaling/signage,mobileandflatpaneldisplay,andmorerecently,generallightingmarkets.Indeed,LEDsnowout-surpassinperformanceallconventional(e.g.,incandescent,fluorescent,high-intensitydischarge)lightsourcesingeneralilluminationapplications.Thequestionarises:whatmoreistobedone?ThuscomesthethesisforthisspecialissueonLEDsandapplications.Fromthecontributedarticles,welearnthatLEDtechnologycontinuestoevolveandtransformitselfnotonlywithintheexistingapplicationsbutisalsopositioningforbrandnewapplicationstocome,bothofwhicharehighlightedhere.

简介：Superluminescencediode(SLD)moduleswithwidespectrumcharacteristicsarerequiredinfibergyroscopes.A1.3μmbutterflypackagedsuperluminescencediodewiththespectrumwidthover30nmisreportedandrecentadvancesinprocessofSLDisdescribedinthepaper.TheSLDmoduleshavebeenappliedtofibergyroscopes.

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简介：Laserdriversareanenablingfactortoinertialconfinementfusion,becauselaserdiodesmustbeusedinsteadofflashlamps.Wediscussthelimitationsoflaserdiodearraysandshowwhatstepstheindustryistaking.Thepumppowerrequirementsoflarge-scaleprojectssuchasLIFEorHiPERarewithinreachofsemiconductorlaserdiodeassemblies.Pulsedlightoutputpowersperlaserbarshavebeenaround300Wperbar,asintheJenoptik940nmbarspreviouslyusedforpumpingtheYb:YAGslabsintheDiPOLEproject.Byredesigningthesemiconductorlaserstructures500Wperbarisnowcommerciallyavailablefor808,880and940nmpumpwavelengths.Theconstructionofoneinertialfusionpowerplantwillrequireanamountofsemiconductorlaserchipsinexcessofthecurrentannualproductionbytwoordersofmagnitude.Thisaddstotheengineeringtaskofimprovingthedevicecharacteristicsachallengetoproductioncapacity.Whiletheindustrybenefitsfromtherecentboostinsolid-statelightingthatactsasatechnologydriver,cooperationbetweenmanufacturerswillbeimperative,andtothisendweproposestandardizationefforts.

简介：Thispaperreviewsthedifferentchallengesthatareencounteredinthedeliveryofhighpowerlasersasdriversforfusionenergy.Wewillfocusondiode-pumpedsolid-statelasersandwewillhighlightsomeofthemainrecentachievementswhenusingytterbium,cryogeniccoolingandceramicgainmedia.Apartfromsomeexistingfusionfacilitiesandsomemilitaryapplicationsofdiode-pumpedsolid-statelasers,wewillshowthatdiode-pumpedsolid-statelasersarescalabletoinertialfusionenergy(IFE)’sfacilitylevelandthattheall-fiberlaserschemeisverypromising.

简介：Thewavelengthtuningragesofagratingexternal-cavitylaserdiode(ECLD)havebeenstudiedbytheequivalentavitymethod.Themaximumtuningrange(MTR)andthecontinuoustundingrange(CTR),whicharerelatedtothemaximumandtheminimumthresholdcarrierdensities,arededucedfromthethresholdcondition.WedefinearatiooftheCTRtotheMRT.ThisratioisonlydeterminedbythereflectivitiesoftheexternalandinternalfacetsoftheECLD.TheanalysisshowsthatthereisanappropriatecombinationoftheexternalandinternalcavityreflectivitestoobtainagivenCTRinthedesignofanECLD.

简介：一根新奇的大光洞激光二极管，由通过隧道连接一起串联的多活跃的区域组成，被建议。在在GaAs底层上与LP-MOCVD系统种epi层以后，山脉波导激光结构被制作，并且它出现象14.4掳一样低的一个横向的分叉角度。CLC数字TN248.4文件代码A这个工作被特殊基础为中国(G20000683-02)的主要州的基本研究工程支持

简介：InGaN-basedlight-emittingdiode(LED)asforthereplacementofconventionalfluorescentlightingsourcestillneedsagreatefforttoimprovethelight-extractingefficiencyaswellasinternalquantumefficiencyofLEDs.Surfaceplasmontechnologyhasrecentlyattractedconsiderableinterest,becausethespontaneousemissionrateandthelightextractionefficiencyofalight-emittingdevicecanbesimultaneouslyenhancedthroughthecouplingbetweenanInGaNquantumwellandsurfaceplasmons.Thesurfaceplasmon-emittercouplingtechniquewouldleadtohighbrightnessmultichipwhiteLEDsthatofferrealisticalternativestoconventionalfluorescentlightsources.Inthisarticle,thepossibleenhancementmechanismofsurfaceplasmonisdiscussed,andthenrecentdevelopmentsofsurface-plasmon-enhancedlight-emittingdiodeareintroduced.

简介：Adiodelaserarray(DLA)positionedinanexternalcavitycanreceivetheradiationsemittedfromitsneighboringelements(C1)andthatofitself(S)afterbeingreflectedattheDLAfacetaswellasfromtheexternalmirror(C0).Consideringthefactthat|C0/S|shouldbelargerthanunityiftheexternalcavityiseffective,and|C1/S|shouldbelargerthanunityifthephaselockingmaybeestablishedintheexternalcavity.Therequirementsonthereflectionatthefacetofthediodelaserarrayhavebeenspecifiedintermsofthecavitylengthandreflectioncoefficientoftheexternalmirror.

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简介：Anewcollimationsystem,theheteroaxialdoublehalf-ellipticalcylinderlens(HDHECL),isproposedbasedontheraytracingmethod,andthecollimationperformanceoftheHDHECLisdiscussedandcomparedwithconventionallenses.ThesimulationresultssuggestthattherefractiveindexoftheHDHECLcanbelargerthan2,thecollimationeffectisimprovedwiththeincreaseoftherefractiveindexinacertainrange,andthedivergenceangleinthefast-axisdirectioncanbecompressedtolessthan0.01mradtheoretically.Theseresultsareofsignificanceintheoryandpractice.

简介：Inapracticalcouplingsystem,acylindricalmicrolensisusedtocollimatetheemissionofahighpowerlaserdiode(LD)inthedimensionperpendiculartothejunctionplane.Usingpassivealignment,theLDisplacedinthefocusofthecylindricalmicrolensgenerally,regardlessoftheperformanceofthemultimodeopticalfiberandtheLD.Inthispaper,amorecompleteanalysisisarrivedatbyray-tracingtechnique,bywhichtheangleθoftherayafterrefractioniscomputedasafunctionoftheangleθooftheraybeforerefraction.ThefocusofthecylindricalmicrolensisnotalwaystheoptimalpositionoftheLD.Infact,inordertoachieveahighercouplingefficiency,theoptimaldistancefromtheLDtothecylindricalmicrolensisdependentonnotonlytheradiusRandtheindexofrefractionnofthecylindricalmicrolens,butalsothedivergenceangleoftheLDinthedimensionperpendiculartothejunctionplaneandthenumericalaperture(NA)ofthemultimodeopticalfiber.Theresultsofthisdiscussionareingoodagreementwithexperimentalresults.

简介：AIMTo检验light-emitting-diode(带)导致的网膜的neuronal房间损坏和它的波长驱动的病原的mechanisms.METHODSSprague-Dawley老鼠暴露于蓝色LEDs(460nm)，绿LEDs(530nm)，和红LEDs(620nm)。染色的网膜电图描述术(尔格)(H&E)，Hematoxylin和曙红，传播电子显微镜学(TEM)，标记的终端deoxynucleotidyltransferasedUTP刻痕结束(TUNEL)，和染色的immunohistochemical(IHC)，西方的弄污(WB)并且superoxide阴离子的察觉(O2桰獯桰牯汹瑡潩???歁???????????椠浭湵景畬牯獥散据??啓呌？？

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简介：Anewwavelengthbeamcombiningtechniqueforahigh-powerlaserdiodebarbyusingatemperaturegradientheatsinkhasbeenproposed.Thethermalcontrollingprincipleofthetemperatureheatsinkhasbeendiscussed.Ithasbeenprovedbyexperimentthatthelineartemperaturedistribution,whichgenerateslinearwavelengthspreadoftheoutputbeamsfromaLDbar,canbeobtainedbyintroducingatemperaturegradientheatsinkandtheoutputbeamscanbefocusedintoarelativesmallspotbyusingtheCzerny-Turnerbeamshapingsystem.

简介：Wereport,forthefirsttimetoourknowledge,anon-chipmode-lockedlaserdiode(OCMLLD)thatemploysmultimodeinterferencereflectorstoeliminatetheneedoffacetmirrorstoformthecavity.TheresultisanOCMLLDthatdoesnotrequirecleavedfacetstooperate,enablingustolocatethisOCMLLDatanylocationwithinthephotonicchip.ThisOCMLLDprovidesasimplesourceofopticalpulsesthatcanbeinsertedwithinaphotonicintegratedcircuitchipforsubsequentphotonicsignalprocessingoperationswithinthechip(modulation,opticalfiltering,pulseratemultiplication,andsoon).Thedevicewasdesignedusingstandardizedbuildingblocksofagenericactive/passiveInPtechnologyplatform,fabricatedinamulti-projectwaferrun,andachievedmode-lockingoperationatitsfundamentalfrequency,giventheuncertaintyatthedesignstepoftheopticallengthofthesemirrors,criticaltoachievecollidingpulsemode-lockedoperation.

简介：Weproposeanultra-widebandopticaldiodedevicebasedontwo-dimensionalsquare-latticephotoniccrystals.Forthedevice,theoddmodeiscompletelytransmittedinonedirectionandconvertedtothefundamentalevenmode,butcompletelyreflectedintheotherdirection.Theoperationbandwidthofthedeviceispreservedwithinaratherwiderangeoffrequencies,whichisover6.5%ofthecentralfrequency.Adirectionalcouplerand90°bendareutilizedasthecompositefunctiondevicewithmodefilterandmodeconverter.Itispossiblethatthephotoniccrystaldevicecanhelptoconstructon-chipopticallogicaldevicesandbenefitgreatlytotheopticalsystemswithmultiplespatialmodes.更多还原

简介：Ahigh-repetitionratemasteroscillatorpoweramplifierpumpedwithlaserdiodes(LDs)isreported.Aninjectionseedingsingle-frequencyelectro-opticalQ-switchedNd:YAGlaserisusedasanoscillator,andaconductivelycooledNd:YAGzigzagslabwithabounce-pumpedarchitectureisutilizedasapoweramplifier.Pulseenergiesofover800mJat1064nmand400mJat532nm,correspondingtoaveragepowersof200and100W,respectively,areachievedwitha12.6-nspulsewidthat250Hz.Outputfrequencyfluctuationsandsingle-frequencyoperationarefurthermonitored.Experimentalresultsrevealthattheproposedsystem,whichfeaturesasingle-passamplifiedconfiguration,isapromisingdesignforspace-basedapplications.