简介：Multielectrodesemiconductorlasersarestudiedviatheraymethod.TheexpressionoftheoutputphotonnumberofN-electrodesemiconductorlasershasbeenderivedforthefirsttime.WhenN=1or2,theexpressionoftheoutputphotonnumberfitsinthatofone-electrode(general)ortwo-electrodesemiconductorlasersperfectly.

简介：Themeasurementtechniquesoffemtosecondspectroscopyareeffectivemethodtoinvestigateultrafastdynamics,theyarewidelyusedinthefieldsofphysics,chemistryandbiology.Inthispaper,theprinciple,experimentsetupandtheapproachestodealwiththeexperimentdatawerepresented.Thendifferentmeasurementtechniquessuchastransientabsorptionspectroscopy,photonechoes,opticalKerreffectanddegeneratefour-wavemixingwereexplainedwithspecialexamples.Atlast,theapplicationprospectofmeasurementtechniquesoffemtosecondspectroscopywasforecasted.

简介：Theuseofultra-highintensitylaserbeamstoachieveextremematerialstatesinthelaboratoryhasbecomealmostroutinewiththedevelopmentofthepetawattlaser.Petawattclasslasershavebeenconstructedforspecificresearchactivities,includingparticleacceleration,inertialconfinementfusionandradiationtherapy,andforsecondarysourcegeneration(x-rays,electrons,protons,neutronsandions).Theyarealsonowroutinelycoupled,andsynchronized,tootherlargescalefacilitiesincludingmegajoulescalelasers,ionandelectronaccelerators,x-raysourcesandz-pinches.Theauthorsofthispaperhavetriedtocompileacomprehensiveoverviewofthecurrentstatusofpetawattclasslasersworldwide.Thedefinitionof‘petawattclass’inthiscontextisalaserthatdelivers>200TW.

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简介：Wereviewrecentadvancesinthefieldofquantumdotlasersonsilicon.Asummaryofdeviceperformance,reliability,andcomparisonwithsimilarquantumwelllasersgrownonsiliconwillbepresented.Weconsiderthepossibilityofscalable,lowsize,weight,andpowernanolasersgrownonsiliconenabledbyquantumdotactiveregionsforfutureshort-reachsiliconphotonicsinterconnects.

简介：Inthiswork,ahybridstructureconsistingofamulticomponentgermanateglassmicrospherecontainingbismuthasagainmediumisproposedandpresented.Thebismuth-dopedgermanateglassmicrosphereswerefabricatedfromaglassfibertipwithnoprecipitationofthebismuthmetal.Couplingwithafibertaper,thebismuth-dopedmicrospheresingle-modelaserwasobservedtolaseataround1305.8nmusing808nmexcitation.Thelowthresholdofabsorbedpumppowerat215μWmakesthismicrolaserappealingforvariousapplications,includingtunablelasersforarangeofpurposesintelecommunication,biomedical,andopticalinformationprocessing.

简介：Wepresenttheworkflowofthedesign,realizationandtestingofdeformablemirrorssuitableforhighpowerdiodepumpedsolid-statelasers.Itstartswiththestudyoftheaberrationtobecorrected,andthenitcontinueswiththedesignoftheactuatorspositionandcharacteristic.Inthispaper,wepresentandcomparethreedeformablemirrorsrealizedformulti-Jlevellaserfacilities.Weshowthatwiththesamedesignconceptitispossibletorealizedeformablemirrorsforothertypesoflasers.Asanexample,wereporttherealizationofadeformablemirrorforfemtosecondlasersandforaCWCO2laser.

简介：Asmid-infrared(MIR)lasersshownumerousapplicationsinthefieldofdefense,medical,materialsprocessing,andopticalcommunications.InvestigationonMIRRamanfiberlasers(RFLs)increasinglybecomesahottopic.Comparedwiththetraditionalsilicafibers,fluorideandchalcogenideglassfiberspossesshighernonlinearcoefficientsandexcellentMIRtransmittances.Inthisarticle,thelatestdevelopmentsoftheMIRRFLsusingfluorideandchalcogenideglassfibersasgainmediaareintroduced,respectively.ThisreviewarticlemainlyfocusesonthedevelopmentsofMIRRFLsinaspectsofoutputwavelength,outputpower,andopticalefficiency.Besides,theprospectofMIRRFLsisalsodiscussed.

简介：Ananalysissolutionofrateequationisderivedforverticalcavitysurface-emittinglasers.BasedontheenhancedspontaneousemissioncausedbyVCSELsandinfluenceofnonradiativerecombination,therelationbetweenoutputpropertiesandstructuralparametersofmulti-quantumwells(MQWs)isobtanined.Itwasfoundthatthecharacteristiccurveofa"thresholdless"laserisstronglynonradiativedepopulation-dependent.Whenthenonradiativedepopulationisnozero,thelight-currentcharacteristicisnotlinearlyevenforanidealclosedmicrocavity.Thelightoutputisincreasedbytheenhancedwellnumberandbythereducedwidth.Inparticular,alowerthresholdcurrentdensityforMQWsstructureintheshortcavityisrealizedbyus,meanwhilethesharpnessofthevariationdependsonspontaneousemissionfactor.

简介：AlineararrayofNmutuallycoupledsingle-modelasersisinvestigated.ItisshownthattheintensitiesofNlasersarechaoticallysynchronizedwhenthecouplingbetweenlasersisrelativelystrong.Thechaoticsynchronizationofintensitiesdependsonthelocationofthelasersinthearray.Thechaoticsynchronizationappearsbetweentwooutmostlasers,thesecondtwooutmostlasers,etc.Thereisnosynchronizationbetweennearestneighborsofthelasers.IfthenumberofNisodd,themiddlelaserisneversynchronizedbetweenanylasers.ThechaoticsynchronizationofphasesbetweennearestlasersinthearrayisexaminedbyusingtheanalyticsignalandtheGaussianfiltermethodsbasedonthepeakofthepowerspectrumoftheintensity.Itcanbeseenthatthemessageofchaoticintensitysynchronizationisconveyedthroughthephasesynchronization.

简介：Quantumdotlasershaveexcellentcharacteristicssuchastimperaturestabilityofthresholdcurrentandultra-highmaterialgain.Quantumdotstructuresfabricatedbyself-organizedgrowthhavehighcrystallineperfection,highquantumyieldofradiativerecombinationandhighsizehomogeneity.Mainadvantagesandoperatingpropertiesofquantumdotalsersfabricatedbyself-organizedgrowtharebrieflyintroduced.

简介：Whenexposedtointenseelectromagneticfields,thequantumvacuumisexpectedtoexhibitpropertiesofapolarizablemediumakintoaweaklynonlineardielectricmaterial.Variousschemeshavebeenproposedtomeasuresuchvacuumpolarizationeffectsusingacombinationofhigh-powerlasers.Motivatedbyseveralplannedexperiments,weprovideanoverviewofexperimentalsignaturesthathavebeensuggestedtoconfirmthispredictionofquantumelectrodynamicsofrealphoton–photonscattering.

简介：InGaAsP/GaAsSCHSQWlaershavebeenpreparedbyLPMOCVD.Thedependenceofthresholdcurrentdensityoncavitylengthwasexplained.Laserdiodesarecharacterizedbytheoutputpowerof1W20W,thresholdcurrentdensity(Jth)of330A/cm^2to450A/cm^2andexternaldifferentialquantumefficiency(ηd)of35%to75%,andthesecharacteristicsareingoodagreementwiththedesignedrequirement.

简介：Recentprogressonrare-earthdopedpolycrystallineYAGtransparentceramicshasmadethemanalternativenovelsolid-statelasergainmaterial.Inthispaper,wepresentresultsofourresearchonpolycrystallineRE:YAGtransparentceramics.HighopticalqualityYAGceramicsdopedwithvariousrare-earth(RE)ionssuchasNd3+,Yb3+,Er3+,Tm3+,andHo3+havebeensuccessfullyfabricatedusingthesolid-statereactivesinteringmethod.Highlyefficientlaseroscillationsofthefabricatedceramicsaredemonstrated.

简介：Ashortoverviewofthetheoryofaccelerationofthinfoilsdrivenbytheradiationpressureofsuperintenselasersispresented.Asimplecriterionforradiationpressuredominanceatintensitiesaround5×1020Wcm-2isgiven,andthepossibilityforfastenergygainintherelativisticregimeisdiscussed.

简介：Therelationshipbetweengainandcarrierdensityisanalysed.Inthequantumwell(QW)lasers,initially,thegainincreasesrapidlywiththecarrierdensityandthenstartstosaturate.ItcanbeseenthatQWlasershaveahigherdifferentialgainbecauseofthestep-likestatedensity,andthatthegainsaturatesathighercarrierdensitiesbecauseoftheconstantstatedensityofthelowestsubband.Itisshownthatsimpleogarithmicgain-carrierdensityismoreaccuratethanthetraditionallinearizedformforaQWlaser.

简介：Thepropertiesofaseriesofphasemeasurementtechniques,includinginterferometry,theHartmann–Shackwavefrontsensor,theknife-edgetechnique,andcoherentdiffractionimaging,aresummarizedandtheirperformanceinhighpowerlaserapplicationsiscompared.Theadvantages,disadvantages,andapplicationrangesofeachtechniquearediscussed.

简介：Mid-infrared(mid-IR)lasers,generallydefinedashavinganoperationwavelengthinthespectralregionof2μmto20μm,haveattractedgreatscientificandtechnologicalinterestsowingtotheirwidespreadapplications.Thiswavelengthrangenotonlycontainssome

简介：为微波photonic过滤器的一个一般理论模型基于多波长光来源和散媒介被总结并且介绍，并且被用于double-laser-based微波photonic槽口过滤器鈥?性能的分析。双边带(DSB)的不同影响调整并且单个边带(SSB)调整理论上被表明并且解释。而且，不同因素的影响微波photonic槽口过滤器的表演上的3dB带宽和光谱振幅失配例如频率间距，是也学习了。数字模拟结果在对预言的好同意，并且能为微波photonic过滤器的未来优化有益。CLC数字TN253这个工作被浙江省的科技系partically支持(资助没有。R104154)。