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简介：Wereportanindex-coupleddistributedfeedbackquantumcascadelaserbyemployinganequivalentphaseshift(EPS)ofquarter-waveintegratedwithadistributedBraggreflector(DBR)atλ~5.03μm.TheEPSisfabricatedthroughextendingonesamplingperiodby50%inthecenterofasampledBragggrating.ThekeyEPSandDBRpatternarefabricatedbyconventionalholographicexposurecombinedwiththeopticalphotolithographytechnology,whichleadstoimprovedflexibility,repeatability,andcost-effectiveness.Stablesingle-modeemissioncanbeobtainedbychangingtheinjectioncurrentorheatsinktemperatureevenundertheconditionoflargedrivingpulsewidth.

简介：我们建议为多国参加的ionicGreenberger-Horne-Zeilinger(GHZ)的产生的一个计划仅仅由single-qubit说大小。我们的计划不需要不仅连接大小而且避免同步的困难thetwo的到达时间散布了光子，它被以前的计划面对。因此，我们的entanglementgeneration计划能基于原子干扰inexperiment比计划更容易被实现。

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简介：Duetothelackofmodeselectioncapability,singlewhispering-gallery-mode(WGM)lasingisachallengetoachieve.Inbottlemicroresonators,thehighlynondegeneratedWGMsarespatiallywell-separatedalongthelong-axisdirectionandprovidemodeselectionaccordingtotheiraxialmodenumbers.Inthiswork,weusealoss-engineeringapproachtosuppressthehigher-orderWGMsanddemonstratesingle-modelasingemissioninsmallpolymerbottlemicroresonators.ThefibertapersarenotonlyusedtocouplepumplightintothebottlemicroresonatorstoexcitetheWGMsbutalsotobringopticallossesthatareinducedfromthediametermismatchbetweenfibertapersandmicroresonators.Byadjustingthecouplingpositions,thediametersoffibertapers,andthecouplingangles,singlefundamental-modelasingisefficientlygeneratedwithside-modesuppressionfactorsover15dB.Ourloss-engineeringapproachisconvenientjustbymovingthefibertaperandmayfindpromisingapplicationsinminiaturetunablesingle-modelasersandsensors.

简介：Inthisstudy,anelectro-mechanicalvalve(EMV)systemfortheintakevalveofafourstroke,singlecylinder,overheadvalveandsparkignition(SI)enginewasdesignedandconstructed.AnenginewiththeEMVsystemandastandardengineweretestedtoobservetheeffectsoftheEMVonengineperformanceandemissionsatdifferentspeedsunderfullload.TheEMVengineshowedimprovedenginepower,enginetorqueandbreakspecificfuelconsumption(BSFC).A66%decreaseinCOemissionswasalsoobtainedwiththeEMVsystem,buthydrocarbons(HC)andNOxemissionsincreasedby12%and13%respectively.

简介：Amodelforanexcited-atomcoupledleakycavityinsingle-photongenerationisproposedbasedonuniversalmodes.Solvablemotionequationsoftheatomicoperatorsareobtainedunderthesingle-photonconditionbyadoptingtheLorentzianlinetypeoftheuniversalmodes.

简介：最近，大努力在任意的弄歪的设备的制造被作了满足便携、小的电子产品的要求。当它是一个很挑战性的工作时，灵活底层上的高水晶的优秀电影的直接生长是最理想的方法与当前的半导体设备由于简单、兼容的准备技术的优点制作灵活设备，并且通常非结晶、多晶或不连续的单个水晶的电影被完成。这里，我们表明高质量的双性人2Te3单身者由修改的热墙取向附生技术的灵活polyimide底层上的水晶的电影。试验性的结果表明邻近的雏晶协调地被联合形成一部连续电影，尽管迷惑的雏晶的数量由于快生长率被产生。由把一个石英过滤器插入到生长试管，迷惑的雏晶的数字密度有效地由于改进螺线相互作用被减少。而且，灵活双性人2Te3光电导体被制作并且在弯曲的不同的度下面展出强壮的在红外线附近的光导的反应，它也证实对电子应用合适的获得的灵活电影。

简介：Two-dimensionalatomic-layeredmaterialisarecentresearchfocus,andsinglelayerTa2O5usedasgatedielectricinfield-effecttransistorsisobtainedviaassembliesofTa2O5nanosheets.However,theelectricalperformanceisseriouslyaffectedbyelectronicdefectsexistinginTa2O5.Therefore,spectroscopicellipsometryisusedtocalculatethetransitionenergiesandcorrespondingprobabilitiesfortwodifferentchargedoxygenvacancies,whoseexistenceisrevealedbyx-rayphotoelectronspectroscopyanalysis.SpectroscopicellipsometryfittingalsocalculatesthethicknessofsinglelayerTa2O5,exhibitinggoodagreementwithatomicforcemicroscopymeasurement.NondestructiveandnoncontactspectroscopicellipsometryisappropriatefordetectingtheelectricaldefectslevelofsinglelayerTa2O5.

简介：Wepresentacontinuous-wavesingly-resonantopticalparametricoscillatorwith1.5%outputcouplingoftheresonantsignalwave,basedonanangle-polishedMgO-dopedperiodicallypoledlithiumniobate(MgO:PPLN),pumpedbyacommercialNd:YVO4laserat1064nm.Theoutput-coupledopticalparametricoscillatordeliversamaximumtotaloutputpowerof4.19Wwith42.8%extractionefficiency,acrossatuningrangeof1717nminthenear-andmid-infraredregion.Thisindicatesimprovementsof1.87Winoutputpower,19.1%inextractionefficiencyand213nmintuningrangeextensionincomparisonwiththeopticalparametricoscillatorwithnooutputcoupling,whileattheexpenseofincreasingtheoscillationthresholdbyafactorof～2.Moreover,itisconfirmedthatthefiniteoutputcouplingalsocontributestothereductionofthethermaleffectsincrystal.

简介：Pulsecontrastisacrucialparameterofhighpeak-powerlaserssincetheprepulsenoisemaydisturblaser–plasmainteractions.Contrastmeasurementisthusaprerequisitetotacklethecontrastchallengeinhighpeak-powerlasers.Thispaperpresentstheprogressreviewofsingle-shotcross-correlator(SSCC)forreal-timecontrastcharacterization.WebeginwiththekeytechnologiesthatenableanSSCCtosimultaneouslypossesshighdynamicrange(1010),largetemporalwindow(50–70ps)andhighfidelity.WealsosummarizetheinstrumentationofSSCCprototypesandtheirapplicationsonfivesetsofpetawattlaserfacilitiesinChina.Finally,wediscusshowtoextendcontrastmeasurementsfromtimedomaintospatiotemporaldomain.Real-timeandhigh-dynamic-rangecontrastmeasurements,providedbySSCC,cannotonlycharacterizevariouscomplexnoisesinhighpeak-powerlasersbutalsoguidethesystemoptimization.

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简介：ThisworkismainlytostudytheeffectofheavyionirradiationonthedamageofsinglelayerMoS2.ThenumberoflayersofMoS2preparedbyCVD(chemicalvapordeposition)methodwasdeterminedbyopticalmicroscopyandRamanspectroscopy.ThemonolayerMoS2preparedbyCVDunderhighenergy209BiionirradiationwasanalyzedbyRamananalysisandAFMobservation.AndtheresultsarecomparedandanalyzedbeforeandafterthebeamirradiationofsinglelayerMoS2preparedbymechanicalstrippingmethod.

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简介：AsinglemodehybridⅢ-Ⅴ/siliconon-chiplaserbasedontheflip-chipbondingtechnologyforon-chipopticalinterconnectionisdemonstrated.AsinglemodeFabry-Perotlaserstructurewithmicro-structuresonanInPridgewaveguideisdesignedandfabricatedonanInP/AlGaInAsmultiplequantumwellepitaxiallayerstructurewaferbyusingi-linelithography.Then,asiliconwaveguideplatformincludingalasermountingstageisdesignedandfabricatedonasilicon-on-insulatorsubstrate.Thesinglemodelaserisflip-chipbondedonthelasermountingstage.Thelasinglightisbutt-couplingtothesiliconwaveguide.Thelaserpoweroutputfromasiliconwaveguideis1.3mW,andthethresholdis37mAatroomtemperatureandcontinuouswaveoperation.

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简介：Inthispaper,weproposeahighlyautomaticapproachfor3Dphotorealisticfacereconstructionfromasinglefrontalimage.Thekeypointofourworkistheimplementationofadaptivemanifoldlearningapproach.Beforehand,anactiveappearancemodel(AAM)istrainedforautomaticfeatureextractionandadaptivelocallylinearembedding(ALLE)algorithmisutilizedtoreducethedimensionalityofthe3Ddatabase.Then,givenaninputfrontalfaceimage,thecorrespondingweightsbetween3DsamplesandtheimagearesynthesizedadaptivelyaccordingtotheAAMselectedfacialfeatures.Finally,geometryreconstructionisachievedbylinearweightedcombinationofadaptivelyselectedsamples.Radialbasisfunction(RBF)isadoptedtomapfacialtexturefromthefrontalimagetothereconstructedfacegeometry.Thetextureofinvisibleregionsbetweenthefaceandtheearsisinterpolatedbysamplingfromthefrontalimage.Thisapproachhasseveraladvantages:(1)Onlyasinglefrontalfaceimageisneededforhighlyautomaticfacereconstruction;(2)Comparedwithformerworks,ourreconstructionapproachprovideshigheraccuracy;(3)ConstraintbasedRBFtexturemappingprovidesnaturalappearanceforreconstructedface.

简介：Atunablesingle-passbandmicrowavephotonicfilterisproposedanddemonstrated,basedonalaserdiode（LD）arraywithmultipleopticalcarriersandaFabry-Perot（F-P）laserdiode.MultipleopticalcarriersinconjunctionwiththeF-PLDwillrealizeafilterwithmultiplepassbands.Byadjustingthewavelengthsofthemultipleopticalcarriers,multiplepassbandsaremergedintoasinglepassbandwithabroadenedbandwidth.Byvaryingthenumberoftheopticalcarrier,thebandwidthcanbeadjusted.Thecentralfrequencycanbetunedbyadjustingthewavelengthofthemultipleopticalcarrierssimultaneously.Asingle-passbandfilterimplementedbytwoopticalcarriersisexperimentallydemonstrated.

简介：我们在场为在洞量electrodynamics的三水平的系统的n-qubitW状态的概率的产生的一个简单计划。一旦W状态被准备，它将由于三水平的原子的二个仅仅退化地面状态被包含的事实对原子的自发的排放感觉迟钝。与系统的时间进化，成功概率和试验性的可行性也被讨论。

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