首页 | 本学科首页   官方微博 | 高级检索  
相似文献
 共查询到20条相似文献,搜索用时 31 毫秒
1.
ProgressInPhysicsispublishedbyTheChinesePhysicalSocietythroughTheJiangsuPressforScienceandTechnology .Thisjournalcarriesreviewarticlesaboutnewachievementsanddevelopmentsinallaspectsofphysics.Itcoversfrontierareasofphysicsaswellasnewtrendsintheolderbra…  相似文献   

2.
1 Introduction  Opticaltomographyofscatteringmediasuchasbiologicaltissuesisanincreasinglyactivefieldbecauseofitsadvantagesinnoninvasion ,nonionizationandopticalcontrastwhenitisusedforbiomedicaldiagnosis[1] .Themechanismofopticalimagingisbasedonthediffere…  相似文献   

3.
1 Introduction  Thereisanincreasingrequirementfortheprecisemeasurementofthesurfacemicrostructuresonlarge scaleobjectsofcomplexshapewithsteepsurfaceslopes .Thestylusinstrumentiswidelyusedasthepracticalmethod ,butthemeasurementaccuracyislimitedduetoitscon…  相似文献   

4.
Introduction  Semiconductordeviceshavebeenwidelyusedforvariousapplicationsandbecomeindispensableforcivilizedlife style.Avarietyofchemicalsandmaterialsareusedinprocessofmanufacturingofsemiconductordevices.Atracelevelofmetallicimpu ritiesinthechemicalsan…  相似文献   

5.
1 Introduction  Theopticalcharacteristicsofglasses,suchasglasstransparencyandtheircapabilitytoacceptrareearthionsastheluminescentcenters ,areessentialfortheiruseinglasslasertechnology .Duringthelastfewyears,alargevarietyofinorganic glasseshavebeendevelop…  相似文献   

6.
1 Introduction  Taperedsemiconductortravelling waveamplifiersnowareoneoftheimportantresearchsubjectsinsemiconductoropto electronics.Basedontheseresearchresults,thecouplingefficiencybetweenfiberandsemiconductoramplifier,thelifetimeofdevicesandthe perform…  相似文献   

7.
Introduction  Duetoanisotropicopticalandelectricalproperties,theopticalpropertiesofliquidcrystalscanbeadjustedbyelectricfield,andthusthediffractiongratingfabricatedusingliquidcrystalscanbeadjustablebyelectricfield.Suchdeviceshavepotentialapplications…  相似文献   

8.
1 Introduction  Inopticalcommunication ,opticalsensingsystem ,andhighresolutionspectroscope ,lasersourceswithnarrowlinewidtharealwaysnecessary .Fiberringlasersandactivefiberringresonatorfiltersmaybeappliedtoproducenarrowlinewidthlasers .Becausethecharacte…  相似文献   

9.
ProgressInPhysicsispublishedbyTheChinesePhysicalSocietythroughTheJiangsuPressforScienceandTechnology .Thisjournalcarriesreviewarticlesaboutnewachievementsanddevelopmentsinallaspectsofphysics.Itcoversfrontierareasofphysicsaswellasnewtrendsintheolderbra…  相似文献   

10.
1 Introduction  Two photonabsorption (TPA)isaprocessinwhichtwophotonsaresimultaneouslyabsorbedtoanexcitedstateinamediumviaavirtualstate .TPAintensityischaracterizedbyTPAcrosssection .SuchmaterialswithlargeTPAcrosssectionhavereceivedconsiderableattentioni…  相似文献   

11.
1 Introduction  Theblue violetlaserisusedinmanyfieldssuchasopticalinformationstorage,opticalcommunication,display,etc..Itcanberealizedfromfrequencydoublingofasemiconductorlaseratroomtemperature.Thislightsourcehastheadvantagesofall solid state ,compactness,…  相似文献   

12.
1 Introduction  Layerstructuresanddefectsofafiberreinforcedcompositematerialaretwoimportantfactorsforitsstrengthanddamagemechanism.Traditionally,onecangetsurfaceinformationofacompositebymeansofopticalmetrology,suchasholographicinterferometry,speckle…  相似文献   

13.
1 Introduction  Theinverse problemsinopticaltomography[1] areconcernedwithdeterminationofopticalpropertiessuchasabsorptioncoeficientsandscatteringcoefficientsfromsurfacemeasurementsofturbidmediairradiatedbylight.Therearelargeamountofsurfacemeasurementst…  相似文献   

14.
Spectroscopic Properties of Yb 3 doped Borate Glasses   总被引:1,自引:0,他引:1  
Introduction  Theemissioncrosssectionandfluorescencelifetimearefundamentalspectroscopicpropertiesoflaserglasses.ThesepropertiescanbecalculatedusingintensityparametersΩt(t=2,4,6)basedontheJuddOfelttheory[1,2].Theopticalandspectroscopicpropertiesofra…  相似文献   

15.
1 Introduction  PhotoniccrystalisGenerallycomposedofperiodicallydistributeddielectricmaterials .Becauseofthisperiodicity ,itmaypossessaphotonicband gap .Thismeansthatelectromagneticwavesofcertainwavelengthsandwavevectorsareforbiddentopropagate .Aphotonmay…  相似文献   

16.
Asweknow ,asinglemodefibercouplerisasimplebutveryimportantfiberopticdevice ,whichcanbeusedincommunicationandsensors.Usingsinglemodeopticalfiberdevices,wecanfabricateseveralacoustic opticdevices ,suchasfrequencyshifters ,modulatorsandtunablefilters .Several…  相似文献   

17.
1 Introduction  Enhancementofresolutionpowerofopticalsystemsbeyondthediffractionlimitsoropticalsuperresolution ,hasconsiderabletheoreticalandpracticalinterest.Inoptical superresolutiontechniques,onegenerallyplacesafilterattheexitpupilofthesystemtomodify…  相似文献   

18.
1 Introduction  Q switchedlasersareattractivelasersourcesforranging ,altimetry ,lidar,andotherapplicationsrequiringhighenergic pulses .Q switchedfiberlasersystemsbasedonsingle moderare earthdopedfibershaveattractedgreatinterestbecausetheycanbeusedascompact,…  相似文献   

19.
1 Introduction  Opticalfastfrequency hopingcode divisionmultiple accesssystems (FFHOCDMA)haverecentlybeen proposedasacandidateforopticallocalareanetworks(LANs) [1,2 ] .Inthisscheme ,FBGsarecodingdevices,whichslicethespectrumoftheincoming pulsetoreflect .Theoutpu…  相似文献   

20.
1 Introduction  Themethodofresonanceionizatonspectroscopy (RIS)wasintroducedintheearly 1970sfortheultra sensitivedetectionofatoms .Asthenameimplies ,inthetechniqueionshavetobedetected ;sincethecollectionofionsisusuallyconsiderablymoresensitiveandefficienttha…  相似文献   

设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号