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1.
1 Introduction  In 1 970s,KopeikinaandYansonreportedthattheexcitedmoleculescouldeffectivelyexchangetheirenergiestotheground stateatomsthroughcollisionalenergy transferandsubsequentlycauseconsiderablepopulationintheexcitedatomicstatesinsodiumor potassiumva…  相似文献   

2.
1 Introduction  Theinfraredtovisibleupconversionprocessesinrareearthdopedfiberhavebeenattractinggreatinterestbecauseofitsappl?..  相似文献   

3.
1 Introduction  Laser inducedcollisionenergytransfer(LICET)isanopticalphenomenoninvolvingthesimultaneousinteractionsofboththelaserfieldandcollision[1~ 3 ] .ThisLICETreactioncanbewrittenas:A B hΩ →A B (1)Duringthecollisionofatom Awithatom B ,atomAgoesbacktogr…  相似文献   

4.
1 Introduction  Laserdiode(LD)pumpedpassivelyQswitchedminiaturelaserscangeneratehighpowerandhighrepetitionratepulsesinthenanosecondandsubnanosecondregimes,andhavewideapplicationsinmicromachining,ranging,remotesensing,microsurgeryandsoon.Owingtolaserdiode…  相似文献   

5.
1 Introduction  Adouble beamsmutuallypumpedphaseconjugatorgeneratesthephase conjugatereplicaofeachoftwoincidentopticalbeams[1~ 7] .Thetwoincidentbeamsneednotbecoherentwitheachother,andtheycanevenbefromdifferentlasersoperatingatthesamenominalwavelength .Mut…  相似文献   

6.
1 Introduction  Diode pumpedsolid state passive Q switchedsecondharmonicgenerationlaserhashighpowerandhighrepetitionratepulseinnanosecondperiod ,andvariousapplicationsinmicro mechanics ,measurements,film carve ,micro operationsinsurgery ,andsoon[1] .Recent year…  相似文献   

7.
1 Introduction  Opticaldatastoragebymarkingofmicron sizedspotsonadiskwithalaserisanareawithongoingresearchactivity .Opticaldiskdatastoragehasthecombinedadvantagesofhighstoragedensity ,diskremovable,andlargehead diskworkingdistance.Inrecentyears ,write once…  相似文献   

8.
HighReflectionGe0.45Te0.55RecordingFilmsLIUHuiyongJIANGFusongMENLiqiuFANZhengxiuGANFuxi(ShanghaiInstituteofOptics&FineMechani...  相似文献   

9.
1 Introduction  Cr,Tm ,Ho∶YAGisakindofveryimportant 2 μmlasercrystal,whose 2 .1 μmlaserisabsorbedstronglybywatercomponentoftissue,resultinginshallowtissuepenetrationandgoodsurgicalprecisioninmosttypesofsoftandhardtissue .Ho∶YAGlaserhasbecomeanimportantsource…  相似文献   

10.
1IntroductionElectronioncolisionionizationisoneofthemostimportantprocesesinatomicphysics.Theionizationcrossectionsareveryimp...  相似文献   

11.
1 Introduction  Itiswellknownthatconventionalmethodsof producingextremelybroadbandantireflectivesurfacesarelimitedintheinfraredregion ,becauseofthelimitednumberofthin filmcoatingmaterialsavailableforusetoday .Subwavelengthsurface relief gratingshavebeenr…  相似文献   

12.
1 Introduction  Two photonabsorption (TPA )isanimportantnonlinearabsorptionprocessinbothbasicandappliedresearches.Formanyyears,duetotherelativelysmallTPAcross sectionsofmostmaterials,two photonprocesseswerefoundlimitedapplications.Lately ,greatprogresseshav…  相似文献   

13.
1 Introduction  Two photonabsorption (TPA)isaprocessinwhichtwophotonsaresimultaneouslyabsorbedtoanexcitedstateinamediumviaavirtualstate .TPAintensityischaracterizedbyTPAcrosssection .SuchmaterialswithlargeTPAcrosssectionhavereceivedconsiderableattentioni…  相似文献   

14.
1 Introduction  Inthepastthirtyyears ,muchattentionhasbeenpaidtotheconversionofnearinfraredradiationtovisiblelightinrareearthdopedmaterialsduetoits potentialapplicationsinoptical disktechnology ,informationtechnology ,colordisplaysandsoon .Manykindsofrare…  相似文献   

15.
1 Introduction  Computerizedtomographyisoneofthemosteffectivetechniquesinthreedimensionreconstruction,whichneedsprojectionsinvariousviewingdirectionscovering180.Generally,theseprojectionsareasetoflineintegralsoftheabsorptioncoefficients(e.g.inmedicaldiagn…  相似文献   

16.
1 Introduction  Laserignition ,asaprospectivenew typeignitingtechnologyforengineeringapplication ,ispaidmoreandmoreattentionbymanycountries.Thelaserignitionisaverycomplicatedheatingprocess,wecannotknowthedetailedsectioncompletelybyexperimentsonly ,soatthe…  相似文献   

17.
1 Introduction  ThereisagreatdealofinterestinfiberBragggratingsduetotheirmanyimportantapplicationsinthefieldoftelecommunicationsandfibersensors .BecausefiberBragggratingsexhibitdispersionbothinreflection ,especiallywhenthe gratingischirped[1] ,andintransm…  相似文献   

18.
1 Introduction  SinceAshkinetal.[1] proposedtheopticaltrappingofdielectricparticlesbyasingle beamgradientforcetrap ,opticaltweezerstechnologyarousedtheinterestofresearchers,howevertheirattentionwasconcentratedonhighNAmicrolenstweezers.Opticaltrappingtechn…  相似文献   

19.
3-DPhaseObjectReconstructionUsingBeam-DeflectionIterativeTomography¥GAOYiqing(NanchangInstituteofAeronauticalTechnology,Nanch...  相似文献   

20.
EffectsofChangeintheAveragePermittivityonTheVolumeHologram¥CHENXiyuan(PhysicsSection,Section,FushunPetroleumInstitute,Fushun1...  相似文献   

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