简介:Anoveltheoreticalmodelofthermaldiffusionhasbeenestablishedtostudythermalinteractionbetweentwoneighboringdiodsinsemiconductorlaserarrays.Themaincauseoftheocurrenceofthethermalinteractionbetweentwoneighboringdiodesinarraydevicesistheheatconductionthroughheatsink.Weholdthatasthedevicesmusyhaveheatsinktodiffuseheat,thiskindofinteractioninthearraywouldalwaysexist.However,whenthepitchbetweentwoneighboringdiodesinthearrayisreasonablydefined,thistroublesomethermalinteractioncanbesimplyreducedbyusingourmodel.Basedontheindividualdiodeswithleakywaveguidestructure,weexperimentallysucceededinfabricating2D4×4arrays.Thethermalinteractionbetweenupperandlowerdiodesinthe2Darrayisalsoconsideredaswellasthefunctionoftheheatsink.Themeasuredresultsshowthatthepulsepeakoutputpowerofthe2D4×4arrayishighupto11W.
简介:Aninfraredreal-timeimagingsystemusingDSP(digitalsignalprocessor)asthekernelofdigitalsignalprocessingboardispresented.Inthissystem,theimagingdifferenceandnonuniformitycorrectionmethodisdevelopedonthechiptakingadvantageofDSPwithhighspeed.Themethodcombineshardwareandsoftwaretogether,sothatthedifficultyforrealizingsuchamethodwithotherhardwarecanbeovercome.
简介:Inrecentyears,thepotentialofrenewablegreenenergysourceshasbeenextensivelystudied.Theproventechnologywhichisphotovoltaicsolarcellsstrictlydependsondaylightandproduceslow-efficiently.Toovercometherestrictions,onetechnologystudiedisthroughharvestingthethermalradiationenergywhichcanprovidea24-hourenergysource.Thecontinuityofenergysourcespromisesverygoodenergyconversionespeciallyformilitaryapplications.Thisarticlepresentsanewstructurethatcanharvesttheabundantthermalradiationenergyintousableenergyatthewavelengthof10μm.Arectangularstructurewithaperturbationslitwasdesignedtointegratewitharectifiercircuitforgreenenergyconversion.Theslittunneljunctionguidedtheelectromagneticfieldintoajunctionwheretheenergycouldbecollectedandconverted.Anenhancementfactorofapproximately110.6canbeachievedbyaperturbationslitlengthof1.0μm.Theresultsextractedfromtheproposeddesignpromiseabettercandidatetoovercomethedisadvantagesofphotovoltaicsolarcellsforenergyharvestingdevices.
简介:photonic水晶的热性质有18个循环地分布式的核心的纤维(PCF)激光被使用完整向量的有限元素方法调查(女性)。结果证明18核心PCF与单个核心PCF和19核心PCF相比举办更有效的热分散建设。另外,有不同热负担的18核心PCF激光的温度分发被模仿。当热负担在近似对应于600W的抽的力量的80W/m上面时,结果证明核心温度接近近似拉1800K的价值的纤维,当当热负担在近似对应于110W的抽的力量的15W/m上面时,涂层温度接近大约550K的损坏价值时。因此冷却的纤维是必要的完成力量可伸缩。与另外的不同冷却系统相比,使计划凉下来的铜被发现是一个有效方法减少热效果。
简介:ThemorphoussiliconfilmspreparedbyPECVDatsubstratetemperaturesof30℃havebeencrystallizedbyrapidthermalannealingmethod,thebudgetoftime-temperatureintheannealingprocessis600℃for120s,850℃for120s,and950℃for120s.Theresultsindicatethecrystallizationat850℃and950℃arebetterasshowninmicro-Ramanscatteringandscanningelectronicmicroscope.
简介:Athermalmodelofcrystalisestablished.Thetemperaturefielddifferentialequationofthediode-end-pumpedlasercrystalwithcircularcross-sectionandnewboundaryconditions,inwhichtheconvectionheattransferissupposedtoexistbetweenlasercrystalendsandair,isestablished.Theanalyticalexpressionsoftemperaturefield,thermaldistortionandadditionalopticalpathdifference(OPD)ofcrystalareobtained.Bynumericalcalculation,theinfluenceofheattransferonthethermaleffectsoflasercrystalNd:YAGisstudied.Resultsshowthatcrystal'sthermaleffects,includingtemperaturefield,thermaldistortion,OPDandthermalfocallength,areallweakenedastheheattransferthroughendsofcrystalisstrengthened.Thisconclusioncouldbeusedtocontrolthermaleffectsoflasercrystalandimprovelaserworkingstability.
简介:Thethermaldistortionofanopticalreflectorsurfaceduetothechangingsunlightinaspaceenvironmentwillcauseshiftandspreadingofitsreflectedfocusandtherebyinfluencetheperformanceofspace-to-groundlasercommunicationlinks.Basedonthecharacteristicsofaloworbitsatellite,thenormalshiftofaplanmirrorcausedbythermaldistortionisanalyzedwiththesoftwareoftheANSYSoffiniteelementanalysis.Ageneralexpressionofthetransmittedbeamfromadistortedreflectorsurfaceandacountingformulafortheshiftsofthefocuscenterbeforeandafterthermaldistortionarededuced.Theresultofsimulationshowsthatthemagnitudeorderofthenormalshiftoftheantennamirrorsurfacecanbeashighastensofμrad.Theworsethemirrorthermaldistortionis,thelargertheshiftofthereceivedfocuscenteris.Andthechangeoftheshiftsdoesnotobeyalinearrule.
简介:Theeffectofmesasizeonthethermalcharacteristicsofetchedmesavertical-cavitysurfaceemittinglasers(VCSELs)isstudied.ThenumericalresultsshowthatthemesasizeofthetopmirrorstronglyinfluencesthetemperaturedistributioninsidetheetchedmesaVCSEL.Underacertaindrivingvoltage,withdecreasingmesasize,thelocationofthemaximaltemperaturemovestowardsthep-contactmetal,thetemperatureinthecoreregionoftheactivelayerrisesgreatly,andthethermalcharacteristicsoftheetchedmesaVCSELswilldeteriorate.
简介:ThephysicalandelectricalpropertiesofBF2+implantedpolysiliconfilmssubjectedtorapidthermalannealing(RTA)arepresented.ItisfoundthattheoutdiffusionofFanditssegregationatpolysilicon/siliconoxideinterfaceduringRTAarethemajorcausesofFanomalousmigration.FluorinebubbleswereobservedinBF2+implantedsamplesatdosesof1×1015and5×1015cm-2afterRTA.
简介:AsimulationmethodforthethermalanalysisofInAlAs/InGaAs/InPmid--infraredquantumcascadelasers(QCLs)basedonfinite--elementmethod(FEM)ispresented.ThethermaldistributionoftheQCLsonsubstrate--sideorepilayer--sidemountingformsissimulatedandtheresultsarecompared.Resultsshowthattheepilayer--sidemountingformhasmuchbetterheatdissipationcapabilitythanthesubstrate--sidemounting.
简介:ThetransientthermalcharacteristicsoftheridgewaveguideInAsP/InGaAsPMQWlasers,especiallyinvariouspulsedrivingconditions,havebeensimulatedbyusingFEM.Thetemperatureattheactivecoreofthelaserversusthetimehasbeencalculatedaswellaspulsewidthdependenceoftheapparentthermalresistance.Theresultsshowthatthethermalcharacteristicsofthelasersarerelatedtoboththethermalconductivityandthespecificheatofthematerials.
简介:Anexperimentalwaytoanalyzethethermalcharacteriztionofsemiconductorlasersbasedonspectroscopymethodunderpulsedrivingconditionshasbeendeveloped,Byusingthiswaythethermalcharacteristicssofstraincompensated1.3μmInAsP/InGaAsPridgewaveguideMQWlaserdiodeshavebeeninvestigated.Resultsshovwthatbymeasuringandanalyzingthelasingspectraunderappropriatedrivingparametersandtemperatureranges,thethermalresistanceofthelaserdiodescouldbededucedeasily,Ahigerthermalresistanceof640K/Whasbeenmeasuredonanarrowridgelaserchipwithoutsoldering.Otherthermalandspectralpropertiesofthelaserhavealsobeenmeasuredanddiscussed.
简介:Mesoscopic抑制了联合的相互的电容两倍回声电路被抑制泛音振荡器量子化的方法使量子化。Hamiltonian是由单一的转变的方法的diagonalized。这个电路的精力系列被给。费用的量变化和每个环的电流被thermofield动力学(TFD)的方法处于热刺激状态,热挤压的真空状态,热真空状态和真空状态调查。费用和水流的量变化与不仅电路有关是固有的参数并且联合刺激,挤压的系数,挤压的角度和环境温度的大小,而且量数字,这被显示出。并且量变化与时间随温度和腐烂的增加增加。CLC数字TN401由山东省,中国(No.XY05WL01)和大学的Heze大学的自然科学基础支持了山东省的试验性的技术基础,中国(No.S04W138)
简介:Thebuildingintegratedphotovoltaics(BIPV)applicationisoneofthemainstudytopicsinthesustainablebuildingfield.Inthispaper,thehighcolorrenderingindex(HCRI)-BIPVwindowsystemisdevelopedtobeusedintheindoorenvironmentalcontrol,whosemodulematerialhasappearedtobeeffectiveinimprovingthevisibletransmittanceandreducingtheabsorption.Thispaperdescribestheperformanceofgrid-connectedHCRI-BIPVwindowsystemwith0.75kWpcapacityinstalledinanofficebuildingforanaturalventilationsolution.TheexperimentalresultsindicatethataccumulativepowergenerationoftheHCRI-BIPVwindowsystemis157.60WKhduringthe7-monthexperimentperiod.Forconsiderationofeachevaluatedfactors,theHCRI-BIPVwindowsystemnotonlyoffersthepassiveenergysituationforitspowerloadingbutalsoimprovestheindoorthermalenvironmentbynaturalventilation.