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1.
1 Introduction  Inusualopticalrangingtechniques,suchaslow coherenceinterferometry (LCI) [1] ,confocalmicroscopy[2 ] ,andsoon ,themeasurabledisplacementordistanceisjustcalculatedfromtheinterferencesignal,whichonlygivestheopticalpathlength ,theproductoftherefract…  相似文献   

2.
1 Introduction  Pupil planefilterscanbeusedtochangethelightintensitydistributioninthefocalplane ,sotheyhavepotentialapplicationsintheareasofopticaldatastorage[1~ 3 ] ,lithography[4] ,andmicroscopy[5~ 7] .Manypupilfiltershavebeenstudied ,suchasfilterswithvariedamp…  相似文献   

3.
1 Introduction  Sincethefiberwasplaceddirectlybehindthe phasemask ,whichwasoriginallydemonstratedbyK .O .Hilletal.in 1 993[1] ,thismethodhasbeenusedwidelyforwritingfiberBragg grating .However ,thecontacttechniqueofphasemaskcanonlyinscribethefiberBragg gratingwith…  相似文献   

4.
1 Introduction  Theultrafastpulsescanningnear fieldopticalmicroscopyandtemporalresolutionnear fieldspectraltechnique,whichdevelopedfromthecombinationofscanningnear fieldopticalmicroscopy (SNOM )andtheultrafastpulse,haveattractedgreatinterest[1~ 3] .Thesetech…  相似文献   

5.
1 Introduction  Theimpacttechniqueofflyerdrivenbychemicalexplosiveandgasgunhasbeenusedtostudyhigh pressureequation of state (EOS)formanyyears[1] .Becausetheflyerisatalowenergydensityandentropyenhancementstateinthiscase ,itcaneasilyrecoveritsinitialstatebefo…  相似文献   

6.
1IntroductionShadowmoireinterferometryisawholefieldnoncontact3Dmeasurementtechnique.ItisfirstappliedbyH.Takasaki[1]in1970.In...  相似文献   

7.
Analyzing of LED-induced Blood Fluorescent Spectra   总被引:6,自引:0,他引:6  
1 IntroductionThelight inducedfluorescencespectroscopy (LIFS )fordiagnosticsofbiologicaltissues[1,2 ] ,hasbeenwellbuiltupforseveraldecades.Inclinicsthefluorescencemicroscopyandcytometrybecomeroutineprocedurestocharacterize quantitativelythevastmajorityofhuma…  相似文献   

8.
1 Introduction  Electromagneticallyinducedtransparency(EIT)hasattractedmuchattentionduetoitsextensiveapplications,suchasquantumnoisereduction[1] ,pulsematching[2 ,3] ,andenhancementofnonlinearmixing[4 ,5] .Inessence,EITisanatomiccoherenceinducedbyastrongcouplingl…  相似文献   

9.
1 Introduction  Opticaltomographyofscatteringmediasuchasbiologicaltissuesisanincreasinglyactivefieldbecauseofitsadvantagesinnoninvasion ,nonionizationandopticalcontrastwhenitisusedforbiomedicaldiagnosis[1] .Themechanismofopticalimagingisbasedonthediffere…  相似文献   

10.
1 Introduction  Inrecentyears ,increasingattentionhasbeen paidtohigh peak powerall solid statepulsedblue greenlasersforsomeapplicationssuchasspectroscopy ,display ,opticaldatastorage ,underseacommunicationsandsoon .Suchlaserscanberealizedbyintracavityorexter…  相似文献   

11.
1 Introduction  Alongperiodfibergrating (LPFG)isanovelpassivefiberelementarisinginrecentyears[1] .SeveralapplicationsofLPFGhavebeenfound ,suchas gain profileflattenedfilter,band rejectionfilter,andtemperature ,strainornewchemicalsensors[2 ,3] .ItcanbeUV writtenor…  相似文献   

12.
1 Introduction  Themethodsthatcanmeasurethephaseandthe pulsedurationmainlyincludetheFROG[1] (frequency -resolvedopticalgating)andtheSPIDER[2 ] (spectral phaseinterferometryfordirectelectric fieldreconstruction) .FROG[1] usestheunknownpulseitselfasatime delayed ga…  相似文献   

13.
1 Introduction  BecauseLiF∶F- 2 color centercrystalhasitsowndistinguishedcharacteristics[1~ 5] ,ithasbeenusedasactivemediums[4 ,6,7] orasmodulatedelements[8,9] .Inthispaper,wewillintroduceanotherkindofusage ,thatis ,itisusedbothasanactivemediumforcolorcenterlasertuna…  相似文献   

14.
1 Introduction  ThematchedspatialfilteringproposedbyVanderlugt[1] hasreceivedconsiderableattentionbecauseithasinherentadvantageofshiftinvariance ,butthistechniquesuffersfromsensitivitytorotationandscaledeformation .Theinvarianceisthekeytopatternrecogniti…  相似文献   

15.
1 Introduction  Extractingusefulinformationaboutthedynamicalscatterersfromthetemporalfluctuationsofscatteringlightfieldhasbeenstudiedformanyyears.Thedevelopmentofdiffusing wavespectroscopy[1~ 3 ] (DWS)hasextendedthetraditionalapplicationsinsingle scatterin…  相似文献   

16.
1 Introduction  Inrecentyears,boththetheoreticalandexperimentalinvestigationsonlasercoolingandtrappinghavebecomeoneofthemajorfieldsinatomic,molecularandoptical physics[1~ 8] .Thedevelopmentoflasercoolingandtrappingtechnologyisimportantfortheapplicationssu…  相似文献   

17.
1 Introduction  NIRlighthasadvantagesforimagingthehumanbodyduetoitshighersafetyandbetterpenetrationthroughboneincomparisonwithtraditionalimagingtechniquessuchasXrayandultrasound.Soitprovidesapotentiallynoninvasivetoolforclinicaldiagnosisofspaceocc…  相似文献   

18.
1 Introduction  Wavelength tunableultra shortopticalpulsesourcesareattractinggreatinterestforavarietyofapplications,suchasopticalfibersensors,wavelength divisionmultiplexingcommunicationsystemandtime resolvedspectroscopy .Ingeneral,wavelengthtuningisreali…  相似文献   

19.
1 Introduction  Inphotorefractivecrystal,manyapplications,suchasimageamplificationandimagestorage ,needtousethepropertyofhighdiffractionefficiency .Someauthors[1] havereferredthathighdiffractionefficiencyinphotorefractiveLiNbO3crystalcanbeobtainedbywriting…  相似文献   

20.
1 Introduction  Thesynthesisofcarbonnitridethinfilmshasbeenthesubjectofintensestudysincethetheoretical predication[1,2 ] andexperimentalrealization[3] of β C3N4thinfilms.Manyattemptshavebeenmadetosynthesizethismaterialby physicalandchemicalmethods ,suchasreact…  相似文献   

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