简介：本文概述了激光器的产生过程,以及它在激光通信、激光测量和激光在PCB生产中的应用前景.

简介：ThemethodsforprotectingInPsurfaceagainstdegradationduringannealing,includingencapsulantandencpsulant-freetechniques;rapidthermalan-nealingofInPimplantedlayers;implantedionspeciesandsomeprofilesoftypicaldopants,etc.,theyareallthekeytechniquesconcerningionimplantationintose-mi-insulatingInP,andhavebeenreviewedsyntheticallyaswell.

简介：有h<100>的铝氮化物(AlN)电影水晶的取向在希腊语的第二十三个字母(100)上被制作在由搏动的激光免职的房间温度的底层。激光精力密度的效果并且在这些电影的质量上退火被X光衍射学习，Fourier变换红外线的光谱学和扫描电子显微镜学。当有表面上的混杂粒子的增加的数字时，AlN电影的水晶的质量被增加激光精力密度更加改进。在600掳C的退火的处理在这部电影生产一个再结晶过程，由原来的crystallinity，新水晶的取向的外观，和雏晶的增加的改进描绘了。表面在退火期间由于谷物尺寸的增加变得更不平。CLC数字O484.1在资助下面由山东省的自然科学基础支持了没有Y2002A04

简介：Anoveltheoreticalmodelofthermaldiffusionhasbeenestablishedtostudythermalinteractionbetweentwoneighboringdiodsinsemiconductorlaserarrays.Themaincauseoftheocurrenceofthethermalinteractionbetweentwoneighboringdiodesinarraydevicesistheheatconductionthroughheatsink.Weholdthatasthedevicesmusyhaveheatsinktodiffuseheat,thiskindofinteractioninthearraywouldalwaysexist.However,whenthepitchbetweentwoneighboringdiodesinthearrayisreasonablydefined,thistroublesomethermalinteractioncanbesimplyreducedbyusingourmodel.Basedontheindividualdiodeswithleakywaveguidestructure,weexperimentallysucceededinfabricating2D4×4arrays.Thethermalinteractionbetweenupperandlowerdiodesinthe2Darrayisalsoconsideredaswellasthefunctionoftheheatsink.Themeasuredresultsshowthatthepulsepeakoutputpowerofthe2D4×4arrayishighupto11W.

简介：Graphene,asafabulouslynew-emergingcarbonaceousmaterialwithanidealtwo-dimensionalrigidhoneycombstructure,hasdrawnextensiveattentioninthefieldofmaterialscienceduetoextraordinaryproperties,includingmechanicalrobustness,largespecificsurfacearea,desirableflexibility,andhighelectronicconductivity.Inparticular,asanauxiliarymaterialofelectrodematerials,ithasthepotentialtoimprovetheperformanceoflithium-ionbatteries.However,wideutilizationofgrapheneinlithium-ionbatteriesisnotimplementedsincetremendouschallengesandissues,suchasquality,quantity,andcostconcerns,hinderitscommercialization.Thereremainsadebatewhethergraphenecanactasanimpetusintheevolutionoflithium-ionbatteries.Inthisreview,wesummarizethedesirableproperties,severalcommonsynthesismethodsaswellasapplicationsofgrapheneastheanodeinlithium-ionbatteries,seekingtoprovideinsightfulguidelinesforfurtherdevelopmentofgraphene-basedlithium-ionbatteries.

简介：Polyparaphenylene(PPP)ispreparedbyAlCl3-CuCl2catalystswithbenzeneasthemonomerandisdopedbychemicalmethodandN^+ionimplantation.Theinfluencesoftheconcentration,temperatureandtimeofchemicaldopingandthedose,energyandtemperatureofionimplantation,onPPPconductivityareinvestigated.TheresultsshowedthattheconductivityofPPPcanbeimproved4-5ordersofmagnitudebyionimplantationandtheconductivityofPPPcanreachabout0.11S·cm^-1bychemicaldoping.Thecomparisonofstabilityofthematerialconductivebehaviorbyusingthetwodopingmethodsispresented.Itshowsthationimplantationisbetterthanchemicaldopinginstabilizingtheelectricconductivebehaviorforthematerial.

简介：Inordertoovercometheexistingdisadvantagesofofflinelasershockpeeningdetectionmethods,anonlinedetectionmethodbasedonacousticwavesignalsenergyisprovided.Duringthelasershockpeening,anacousticemissionsen-soratadefinedpositionisusedtocollecttheacousticwavesignalsthatpropagateintheair.Theacousticwavesignalissampled,stored,digitallyfilteredandanalyzedbytheonlinelasershockpeeningdetectionsystem.Thenthesystemgetstheacousticwavesignalenergytomeasurethequalityofthelasershockpeeningbyestablishingthecorrespondencebetweentheacousticwavesignalenergyandthelaserpulseenergy.ThesurfaceresidualstressesofthesamplesaremeasuredbyX-raystressanalysisinstrumenttoverifythereliability.Theresultsshowthatboththesurfaceresidualstressandacousticwavesignalenergyareincreasedwiththelaserpulseenergy,andtheirgrowthtrendsareconsistent.Finally,theempiricalformulabetweenthesurfaceresidualstressandtheacousticwavesignalenergyisestablishedbythecubicequationfitting,whichwillprovideatheoreticalbasisforthereal-timeonlinedetectionoflasershockpeening.

简介：在这个统一模型，我们介绍联合时间的电子声子(t即)和激光脉搏宽度(tp)。为长脉搏，它能代替传统的热传导模型；当时为超短波的脉搏，它能代替标准二温度的模型。作为金目标的一个例子，我们在时间得到电子和离子温度发展的依赖并且由用有限差别的时间域(FDTD)解决热传导方程放方法。它在对试验性的数据的好同意。我们用Saha方程获得脱离的发作的临界溶液温度然后当激光脉搏宽度从毫微秒到飞米第二次规模时，获得激光脱离阀值的理论价值，它与试验性的数据在于很好。

简介：新纤维眼的水中听音器被描述。基于分布式的反馈纤维激光(DFB纤维激光)，试验性的安排由DFB-FL组成，失衡的Mach-Zehnder干涉仪，压电(PZT)调节的人，察觉和反馈控制电路，和示波器。试验性的结果证明赤裸的DFB-FL水中听音器对在他们的环境的小不安极其敏感并且能获得准确声学的信号。CLC数字TN256由中国奖学金委员会支持了，中国的自然科学基础(别同意NSFC60677027)，中国的山东省的自然科学基础(别同意Y2006G08)，并且为科学的山东学院的博士研究的基础(别同意2005-79)。

简介：Asphericalmaskforthefabricationofmicrolensarrayswaspreparedbymelt-ingphotoresist,andthesphericalphotoresistshapewastransferredintoasiliconsubstrateusingionbeammilling.TheionbeammillingprocesswascomputersimulatedusingtheSig-mundionbeamsputteringtheoryofcollisioncascades.Theexperimentresultsshowthatmi-crolensarrayscanbeeffectivelyformedatlowsubstratetemperatureoflessthan200℃，Shapesanddimensionsofphotoesistmasksandsiliconmicrolensarrayswereexaminedbythescanningelectronmicroscopeandtestedbythesurfacestylusmeasurement.

简介：芬兰Amphion（奥德菲尔）公司近日推出了新型号Ion（云雀）扬声器。Ion扬声器的外观设计极富创意，浑圆的棱线显得精致而时尚，充满着金属的美感。在性能上，Ion采用了Amphion专利的U／D／D技术，将房间声音反射的影响减至最低，确保在任何环境都可以获得满意的效果。Amphion宣称Ion的音质将达到很高的水准，但价格将会尽量定在一个非常吸引的数字，以便让更多的发烧友可领略到Amphion产品的魅力。权威媒体对它的评价是：“小巧却拥有顶级的声音”。

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

简介：Fromseveralmodelsaboutdamagemechanis,thedamagemecanismofopticalfilmsandthefactorswhichaffectthedamagethresholdaredescribedexperi-mentallyandtheoretically.Somereasonableproposalsaregivenisthispaperonhowtoselectthehigh-thresholdfimls.

简介：与直接脱离相比，prepulse被用来在激光血浆推进提高联合系数。联合系数与在主要横梁和prepulse之间的延期时间是相关的，这被发现。在12ns的一延期时间，联合系数到达5.8脳的最大值10?5N/W。CLC数字O532+.25文件代码A

简介：Highspatialfrequencylaserinducedperiodicsurfacestructures(HSFLs)onsiliconsubstratesareoftendevelopedonflatsurfacesatlowfluencesnearablationthresholdof0.1J/cm2,seldomonmicrostructuresormicrogroovesatrelativelyhigherfluencesabove1J/cm^2.ThisworkaimstoenrichthevarietyofHSFLs-containinghierarchicalmicrostructures,byfemtosecondlaser(pulseduration:457fs,wavelength:1045nm,andrepetitionrate:100kHz)inliquids(waterandacetone)atlaserfluenceof1.7J/cm^2.TheperiodofSi-HSFLsintherangeof110–200nmisindependentofthescanningspeeds(0.1,0.5,1and2mm/s),lineintervals(5,15and20μm)ofscanninglinesandscanningdirections(perpendicularorparalleltolightpolarizationdirection).ItisinterestinglyfoundthatbesidesnormalHSFLswhoseorientationsareperpendiculartothedirectionoflightpolarization,bothclockwiseoranticlockwiserandomlytiltedHSFLswithamaximaldeviationangleof50°ascomparedtothoseofnormalHSFLSsarefoundonthemicrostructureswithheightgradients.RamanspectraandSEMcharacterizationjointlyclarifythatsurfacemeltingandnanocapillarywavesplayimportantrolesintheformationofSi-HSFLs.ThefactthatnoHSFLsareproducedbylaserablationinairindicatesthatmoderatemeltingfacilitatedwithultrafastliquidcoolingisbeneficialfortheformationofHSFLsbyLALs.Onthebasisofourfindingsandpreviousreports,asynergisticformationmechanismforHSFLsathighfluencewasproposedanddiscussed,includingthermalmeltingwiththeconcomitanceofultrafastcoolinginliquids,transformationofthemoltenlayersintoripplesandnanotipsbysurfaceplasmonpolaritons(SPP)andsecond-harmonicgeneration(SHG),andmodulationofSi-HSFLsdirectionbybothnanocapillarywavesandthelocalizedelectricfieldcomingfromtheexcitedlargeSiparticles.

简介：Wehaveanalyzedtheorder-disorderingvarianceduetoresonanceeffectandthenonlinearbehavioroffarinfraredraylaser(FIRL)-biologicalsysteminteraction.TheanalyticresultsshowthattheinteractionbetweenthelivingbiologicalsystemandFIRLcanproduceresonanceexcitationeffect,andsotheoriginalhighorderedstateofthesystemcanbedestroyedandthustheconformationvariationinthesystemcanbeproducedunderfurtheractionofthelaser.Inaddition,wehaveanalyzedthenonlinearpropertiesoftheFIRLbio-moleculeinteractionandexplainedthemutagenesiseffectsofFIRL.ThetheoreticanalysisisconsistentwiththeresultsofFIRLmutagenesisbreedingtest.

简介：Alasersimulatorisproposedwhichisbasedonahardware-in-loop(HWIL)simulationtestsystem.Asanimportantdeviceinthesimulationtestsystem,itisusedtosimulatethelaserenergyandthedivergenceangle.ThelasersimulatorsimulatestheattenuationprocessoflaserenergybythecontinuousrotationofGlanprismsandthechangingoflaserspotsizethroughthecontinuousmotionofthelaserbeamexpandingtelescopeonthestraightplatform.Thedynamicattenuationvelocityofthelasersimulatorisupto4dB/s,andthedivergenceangleadjustmentvelocityisupto3mrad/s.Themethodisfeasibleforthesimulationtest.

简介：Todetectthelaserdopplersignal,theunknownsignalistrackedbytheknownsignalusingtheconceptoftopologicalcontravariance.TheunknowntopologicalspaceUandknownspaceMarefounded,andthentheunknownsignal'stransformationistrackeddynamicallyaccordingtothismappingrelationshipbetweenthetwospaces.Thesystemequationisobtainedbygradient-descentmethod,andtheconditionsofstabilityaregivenbyPoincarémapping.Theproposedmethodisappliedtomeasurethein-planedisplacementsignalofthesolid50mawayusinglaserdoppler,signal.Theresultprovesthatthemethodcandetectlaserdoppler.signalaccurately,itsrelativeerrorislessthan0.7%.

简介：Inthispaper,theoperationprincipleoflaserrotaryencodersisexpoundedandtheopticalquadruplefrequencytechnologyusedinlaserrotaryencodersinex-plained,andthedesignideaofopticalsysteminΦ66mmlaserrotaryencoderismainlyintroduced,aswellasthechoiceofprincipaldevices.

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