共查询到20条相似文献,搜索用时 31 毫秒
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1 Introduction Opticaltomographyofscatteringmediasuchasbiologicaltissuesisanincreasinglyactivefieldbecauseofitsadvantagesinnoninvasion ,nonionizationandopticalcontrastwhenitisusedforbiomedicaldiagnosis[1] .Themechanismofopticalimagingisbasedonthediffere… 相似文献
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DING Zhihua LIU Yu BAO Zhengkang 《Chinese Journal of Lasers》2001,10(3):211-217
1 Introduction Thereisanincreasingrequirementfortheprecisemeasurementofthesurfacemicrostructuresonlarge scaleobjectsofcomplexshapewithsteepsurfaceslopes .Thestylusinstrumentiswidelyusedasthepracticalmethod ,butthemeasurementaccuracyislimitedduetoitscon… 相似文献
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Introduction Semiconductordeviceshavebeenwidelyusedforvariousapplicationsandbecomeindispensableforcivilizedlife style.Avarietyofchemicalsandmaterialsareusedinprocessofmanufacturingofsemiconductordevices.Atracelevelofmetallicimpu ritiesinthechemicalsan… 相似文献
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CHENG Zhenxiang ZHANG Shujun WANG Yan HAN Jianru CHEN Huanchu 《Chinese Journal of Lasers》2001,10(5):383-386
1 Introduction Theopticalcharacteristicsofglasses,suchasglasstransparencyandtheircapabilitytoacceptrareearthionsastheluminescentcenters ,areessentialfortheiruseinglasslasertechnology .Duringthelastfewyears,alargevarietyofinorganic glasseshavebeendevelop… 相似文献
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Huang Dexiu Li Hong 《Chinese Journal of Lasers》2001,10(2):84-88
1 Introduction Taperedsemiconductortravelling waveamplifiersnowareoneoftheimportantresearchsubjectsinsemiconductoropto electronics.Basedontheseresearchresults,thecouplingefficiencybetweenfiberandsemiconductoramplifier,thelifetimeofdevicesandthe perform… 相似文献
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《Chinese Journal of Lasers》1999,(4)
Introduction Duetoanisotropicopticalandelectricalproperties,theopticalpropertiesofliquidcrystalscanbeadjustedbyelectricfield,andthusthediffractiongratingfabricatedusingliquidcrystalscanbeadjustablebyelectricfield.Suchdeviceshavepotentialapplications… 相似文献
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1 Introduction Inopticalcommunication ,opticalsensingsystem ,andhighresolutionspectroscope ,lasersourceswithnarrowlinewidtharealwaysnecessary .Fiberringlasersandactivefiberringresonatorfiltersmaybeappliedtoproducenarrowlinewidthlasers .Becausethecharacte… 相似文献
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WANG Chun WANG Xiaomei SHAO Zongshu ZHAO Xian ZHOU Guangyong WANG Dong JIANG Minhua 《Chinese Journal of Lasers》2001,10(3):233-237
1 Introduction Two photonabsorption (TPA)isaprocessinwhichtwophotonsaresimultaneouslyabsorbedtoanexcitedstateinamediumviaavirtualstate .TPAintensityischaracterizedbyTPAcrosssection .SuchmaterialswithlargeTPAcrosssectionhavereceivedconsiderableattentioni… 相似文献
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JIN Jie JIAO Qiang GUO Shuguang FANG Xiaojun YAO Jianquan LU Fuyun ZHANG Guangyin 《Chinese Journal of Lasers》2001,10(2):81-83
1 Introduction Theblue violetlaserisusedinmanyfieldssuchasopticalinformationstorage,opticalcommunication,display,etc..Itcanberealizedfromfrequencydoublingofasemiconductorlaseratroomtemperature.Thislightsourcehastheadvantagesofall solid state ,compactness,… 相似文献
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LI Xide 《Chinese Journal of Lasers》1999,8(6):503-508
1 Introduction Layerstructuresanddefectsofafiberreinforcedcompositematerialaretwoimportantfactorsforitsstrengthanddamagemechanism.Traditionally,onecangetsurfaceinformationofacompositebymeansofopticalmetrology,suchasholographicinterferometry,speckle… 相似文献
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REN Hongwu FANG Zujie 《Chinese Journal of Lasers》2000,9(5):469-474
1 Introduction Theinverse problemsinopticaltomography[1] areconcernedwithdeterminationofopticalpropertiessuchasabsorptioncoeficientsandscatteringcoefficientsfromsurfacemeasurementsofturbidmediairradiatedbylight.Therearelargeamountofsurfacemeasurementst… 相似文献
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Spectroscopic Properties of Yb 3 doped Borate Glasses 总被引:1,自引:0,他引:1
Introduction Theemissioncrosssectionandfluorescencelifetimearefundamentalspectroscopicpropertiesoflaserglasses.ThesepropertiescanbecalculatedusingintensityparametersΩt(t=2,4,6)basedontheJuddOfelttheory[1,2].Theopticalandspectroscopicpropertiesofra… 相似文献
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SONG Junfeng FU Yanping LIU Yang WANG Haisong LI Xuemei XU Wu WNAG Lijun DU Guotong 《Chinese Journal of Lasers》2001,10(5):395-398
1 Introduction PhotoniccrystalisGenerallycomposedofperiodicallydistributeddielectricmaterials .Becauseofthisperiodicity ,itmaypossessaphotonicband gap .Thismeansthatelectromagneticwavesofcertainwavelengthsandwavevectorsareforbiddentopropagate .Aphotonmay… 相似文献
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CHEN Rongsheng * LIAO Yanbiao 《Chinese Journal of Lasers》2001,10(3):195
Asweknow ,asinglemodefibercouplerisasimplebutveryimportantfiberopticdevice ,whichcanbeusedincommunicationandsensors.Usingsinglemodeopticalfiberdevices,wecanfabricateseveralacoustic opticdevices ,suchasfrequencyshifters ,modulatorsandtunablefilters .Several… 相似文献
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LIU Li DENG Xiaoqiang WANG Guiying XU Zhizhan 《Chinese Journal of Lasers》2000,9(4):337-342
1 Introduction Enhancementofresolutionpowerofopticalsystemsbeyondthediffractionlimitsoropticalsuperresolution ,hasconsiderabletheoreticalandpracticalinterest.Inoptical superresolutiontechniques,onegenerallyplacesafilterattheexitpupilofthesystemtomodify… 相似文献
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XU Lixing MING Hai AN Wei ZHANG Xiaosi WANG Anting LI Wei WANG Li XIE Jianping WU Yunxia 《Chinese Journal of Lasers》2000,(5)
1 Introduction Q switchedlasersareattractivelasersourcesforranging ,altimetry ,lidar,andotherapplicationsrequiringhighenergic pulses .Q switchedfiberlasersystemsbasedonsingle moderare earthdopedfibershaveattractedgreatinterestbecausetheycanbeusedascompact,… 相似文献
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1 Introduction Opticalfastfrequency hopingcode divisionmultiple accesssystems (FFHOCDMA)haverecentlybeen proposedasacandidateforopticallocalareanetworks(LANs) [1,2 ] .Inthisscheme ,FBGsarecodingdevices,whichslicethespectrumoftheincoming pulsetoreflect .Theoutpu… 相似文献
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HUO Binghai GAO Jie CUI Shuanjin H. H. Telle Z. T. Salim 《Chinese Journal of Lasers》2000,9(6):558-562
1 Introduction Themethodofresonanceionizatonspectroscopy (RIS)wasintroducedintheearly 1970sfortheultra sensitivedetectionofatoms .Asthenameimplies ,inthetechniqueionshavetobedetected ;sincethecollectionofionsisusuallyconsiderablymoresensitiveandefficienttha… 相似文献