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简介：Amplitude,phaseandpolarizationareessentialparametersofanopticalfield.Inthepastdecade,withtheenhancementoftechniquesinmanipulatingphaseandpolarizationstatesincomplexopticalfields,opticalvorticesandvectorbeamsareinvestigatedinacloselycoupledfashionintermsofefficientbeamgenerationandmanipulation,stabletransmissionandnoveldetectionaimedatvariousapplications.Inthisspecialissue6invitedpapersdemonstrateanumberoftypicaltopicsinthefield,withemphasisonthevectorialbeamgenerationandopticalcommunicationsystemsutilisingorbitalangularmomentum(OAM).

简介：Wedemonstratedlong-periodgrating(LPG)inscriptiononpolymerfunctionalizedopticalmicrofibersanditsapplicationsinopticalsensing.Opticalmicrofiberswerefunctionalizedwithultraviolet-sensitivepolymethylmethacrylatejacketsand,thus,LPGscouldbeinscribedonopticalmicrofibersviapoint-by-pointultravioletlaserexposure.Fora2mmlongmicrofiberLPG(MLPG)inscribedonopticalmicrofiberswithadiameterof5.4μm,aresonantdipof15dBat1377nmwasobserved.ThisMLPGshowedahighsensitivityofstrainandaxialforce,i.e.,-1.93pm∕μεand-1.15pm∕μN,respectively.AlthoughtheintrinsictemperaturesensitivityoftheLPGsisrelativelylow,i.e.,-12.75pm∕°C,itcanbeincreasedtobe-385.11pm∕°Cbyappropriatesealing.Benefitingfromthesmallfootprintandhighsensitivity,MLPGscouldhavepotentialapplicationsinopticalsensingofstrain,axialforce,andtemperature.

简介：Weproposeanovelsiliconopticalphaseshifterstructurebasedonheterogeneousstrip-loadedwaveguidesonaphotonicsilicononinsulator(SOI)platform.ThefeaturesofanetchlessSOIlayerandloadedstripwouldenhancetheperformanceanduniformityofsiliconopticalmodulatorsonalarge-scalewafer.WeimplementedthephaseshifterbyloadinganamorphoussiliconstripontoanSOIlayerwithaverticalPNdiodestructure.ComparedtotheconventionallateralPNphaseshifterbasedonhalf-etchedribwaveguides,thisphaseshiftershowsa>1.5timesenhancementofmodulationefficiencyandprovides>20GHzhigh-speedoperation.

简介：Recently,opticaltechniqueshaveattractedgreatattentionduetotheirexcellentnon-destructive,non-contact,high-resolution,andfull-fieldcharacteristics.Applicationscanbefoundindiversefieldssuchasprecisionmechanicsandmanufacturing,aerospaceandautomotivetestingandinspection,materialsscience,and

简介：Wediscussthedynamicsofultrashortpulsedlaserexcitationinbulkopticalsilica-basedglasses(fusedsilicaandborosilicateBK7)well-abovethepermanentmodificationthreshold.Weindicatesubsequentstructuralandthermomechanicalenergyrelaxationpathsthattranslateintopositiveandnegativerefractiveindexchanges,compressionandrarefactionzones.Iffastelectronicdecayoccursatlowexcitationlevelsinfusedsilicaviaself-trappingofexcitons,forcarrierdensitiesinthevicinityofthecriticalvalueattheincidentwavelength,persistentlong-livingabsorptivestatesindicatetheachievementoflowviscositymatterstatesmanifestingpressurerelaxation,rarefaction,voidopeningandcompactionintheneighboringdomains.Anintermediateps-longexcitedcarrierdynamicsisobservedforBK7intherangecorrespondingtostructuralexpansionandrarefaction.Theamountofexcitationandthestrengthofthesubsequenthydrodynamicevolutioniscriticallydependentonthepulsetimeenvelope,indicativeofpotentialoptimizationschemes.

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简介：Weproposeafullydistributedfusionsystemcombiningphase-sensitiveopticaltime-domainreflectometry(Φ-OTDR)andOTDRforsynchronousvibrationandlossmeasurementbysettinganingeniousfrequencysweeprate(FSR)oftheopticalsource.TherelationshipsbetweenFSR,probepulsewidthandrepeatperiodaregiventobalancetheamplitudefluctuationofOTDRtraces,thedeadzoneprobabilityandthemeasurablefrequencyrangeofvibrationevents.Intheexperiment,weachievesynchronousvibrationandlossmeasurementwithFSRof40MHz/s,theproblepulsewidthof100nsandrepeatrateof0.4ms.ThefluctuationofOTDRtraceislessthan0.45dBwhenthesignalto-noiseratio(SNR)isover12dBforacapturedvibrationeventlocatedat9.1km.Theproposedmethodcanbeusedfornotonlydetectionbutalsoearlywarningofdamageeventsinopticalcommunicationnetworks.

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简介：Plasmonicgratingstructureshavebeenshowneffectiveatincreasingnear-fieldopticalenhancement.Adoublewidthplasmonicgratingdesignisintroduced,whereeachperiodhastwoalternatingmetalwidthsseparatedbyananogap.Withthisnewdesign,analysishasshownthatplasmonicresonancescouplebetweeneachmetalsection,resultinginevengreateropticalenhancementcomparedwithsingle-widthgratings.Thegeometrythatgivesthegreatestopticalenhancementhasbeendeterminedwithacomputationalmodel.Thisworkdemonstratesthattheincreasedenhancementisduetohybridizedmodesthatcouplebetweenthetwogratingsegments.

简介：Weproposeanovelsmall-anglemeasuringopticalmethodbasedontheastigmaticeffectoftwoorthogonallyplacedcylindricallenses.Accordingtotheone-to-onecorrespondencebetweenthelaserspotshapeandtheangle,theangleisdetermined.Wetheoreticallyanalyzethemeasuringrangeanddemonstratethatalongerdistancebetweentherotatingaxisandtheopticalaxisleadstoasmallermeasuringrange,butbettersensitivity.Also,anassociatedexperimentalsystemisestablishedandameasuringrangeof0.94mrad(cubicfitr=0.9993)aswellasagoodlinearrangeof0.37mrad(linearfitr=0.9994)witharesolutionof8μradisachieved.

简介：Weexperimentallyinvestigateprobetransmissionsignals（PTS）,thefour-wavemixingphotonicbandgapsignal（FWMBGS）,andthefluorescencesignal（FLS）inaninvertedY-typefourlevelatomicsystem.Forthefirsttime,wecomparetheFLSofthetwoground-statehyperfinelevelsofRb85.Inparticular,thesecond-orderandthefourth-orderfluorescencesignalsperformdramaticdressingdiscrepanciesunderthetwohyperfinelevels.Moreover,wefindthatthedressingfieldhassomedressingeffectsonthreesuchtypesofsignals.Therefore,wedemonstratethatthecharacteristicsofPTS,FWMBGS,andFLScanbecontrolledbyfrequencydetunings,thepowersorphasesofthedressingfield.Suchresearchcouldhavepotentialapplicationsinopticaldiodes,amplifiers,andquantuminformationprocessing.

简介：在这封信，空间光(FSO)用有图案的调整和桶察觉的通讯被介绍在复杂、吵闹的环境改进位错误率(BER)性能。散布的光在这通讯结构被平均。秒顺序关联，小浪正规化，并且察觉到压缩在重建算法被联合。有N位的一个信号从大部分被重建很好不到N大小。没有光过滤器在传统的FSO通讯使用了的narrowband，数字模拟和实验被执行。它能也在安全通讯被要求的真实网络被采用。这提供大机会为FSO通讯的真实应用铺平道路。

简介：Inopticalscanningholography,onepupilproducesasphericalwaveandanotherproducesaplanewave.Theyinterferewitheachotherandresultinafringepatternforscanningathree-dimensionalobject.Theresolutionofthehologramreconstructionisaffectedbythepointspreadfunction(PSF)oftheopticalsystem.Inthispaper,wemodulatethePSFbyaspiralphaseplate,whichsignificantlyenhancesthelateralanddepthresolution.Weexplainthetheoryforsuchresolutionenhancementandshowsimulationresultstoverifytheefficacyoftheapproach.

简介：Furtheradvancementofhigh-energypulsedlasersrequiresaparalleldevelopmentofappropriateopticalcomponents.Severaldifferentopticalcomponents,suchasmirrorsandantireflection-coatedwindows,whichareessentialforthedesignofHiLASEhighaveragepowerlasersweretested.Thefollowingpapersummarizesresultsonthemeasurementsoflaser-induceddamagethresholdofsuchcomponents,andclearlyshowstheircapabilitiesandlimitationsforsuchademandingapplication.

简介：喷雾器粒子清除的降水是在能改变物理的喷雾器和光性质的空气的一个重要移动过程。这份报纸在在集体集中的situ观察使用的四个雨事件前后在物理的喷雾器和光性质分析变化，数字集中，粒子尺寸分发，散布并且在在Xianghe全面大气的观察的6月和2013年7月的喷雾器的吸收系数在中国驻扎。清除的雨的效果与雨紧张和持续时间，风速度和方向有关的结果表演。在雨事件期间，喷雾器数字集中的时间的变化与在集体集中的变化一致，但是他们的解决尺寸的清除比率是不同的。在雨事件以后，喷雾器团集中的增加与直径以粒子的增加开始了<0.8m[使用空气动力学的粒子sizer(APS)测量]，并且有直径的好粒子<0.1m[使用扫描活动性粒子sizer(SMPS)测量]。降雨在与直径~移开粒子是很有效的0.6m并且比3.5m大。在粒子数字分发的山峰价值的变化(使用SMPS测量)在雨事件在100-120nm以内在粒子上反映强壮的清除效果前后，缩放范围。喷雾器在雨事件前后散布和吸收系数的变化模式是类似的，但是他们的清除比率不同它可能与喷雾器粒子尺寸分发和化学作文有关。

简介：Weexperimentallydemonstratea4×4nonblockingsiliconthermo-optic(TO)switchfabricconsistingofthreestagesoftunablegeneralizedMach–Zehnderinterferometers.All24routingstatesfornonblockingswitchingarecharacterized.Thedevice’sfootprintis4.6mm×1.0mm.Measurementsshowthattheworstcrosstalkofallswitchingstatesis-7.2dB.Theon-chipinsertionlossisintherangeof3.7–13.1dB.TheaverageTOswitchingpowerconsumptionis104.8mW.

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简介：Anopticalfibermagneticfieldsensorforthedual-parametersimultaneousmeasurementisproposedanddemonstrated.Thesensorheadisconstructedbyapeanut-shapestructureandlongperiodfibergrating(LPFG)coatedbymagneticfluid(MF).Theexternalmagneticfieldintensitycanbemeasuredbythevariationofcharacteristicwavelength(Dip1andDip2)ininterferencespectrumsincetheeffectiverefractiveindexofMFchangeswithexternalmagneticfieldintensity.Whentheexternalmagneticfieldintensitychangesfrom0mTto20mT,themagneticfieldsensitivitiesofDip1andDip2are-0.064nm/mTand-0.041nm/mT,respectively.ExperimentalresultsshowthatthetemperaturesensitivitiesoftheDip1andDip2are0.233nm/℃and0.186nm/°C,respectively.Therefore,thesimultaneousmeasurementofthemagneticfieldintensityandtemperatureisdemonstratedbasedonthesensitivematrix.Ithassomepotentialapplicationsinaerospace,environmentalmonitoringandmedicalsensingfields.