调制场作用下相干布居捕获和光学双稳的研究

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1、华中师范大学硕士学位论文调制场作用下相干布居捕获和光学双稳的研究姓名：王剑申请学位级别：硕士专业：光学指导教师：胡响明20070612硕士学位论文MASTER‘STHESISAbstractThedispersionandabsorptionareapairoffundamentalpropertiesofopticalmedium．Theuseofthedispersivepropertiesisoftenlimitedbytheabsorption．Thedispersion—absorptionrelationsoft

2、hetwo-levelatomsystemtellUSthatatorneartheresonancefrequency，theindexofrefractionislargebutabsorptionisequallylarge．Farfromresonance，thetwo-levelmediumbecomestransparentbuttheindexofre-fractionisalmostthesameasthatinavacuum．However，thedispersion·absorptionrelations

3、ofthemediacallbedramaticallymodifiedbyemployingcoherentfieldstodriveit．Quantumcoherenceandinterferencehaveledtotheoccurrenceofmanyneweffectsandtechniques．ExamplesincludeCoherentPopulationTrapping(CPT)，ElectromagneticallyInducedTransparency(EIT)，LasingWithoutInversi

4、on，andEn-hancementoftheIndexofRefractionWithoutAbsorption．Theseneweffectshavemanypotentialapplicationsinfundamentalphysicsandappliedphysics．Inthispaper，weinvestigatemanipulationofthequantuminterferenceinthecaseofmodu-latedfieldsinamultilevelatomicsystem(three—level

5、人system)fromdifferentpointofview．Firstly,weexaminetheeffectsofcrosscorrelatedphasefluctuationsonCPTinducedbyapairofphase-modulatedfieldswithequalmodulationfrequenciesinathree-levelAsystem．Themaximalcoherenceof一0．5，whichappearswhenCPToccursforequalmodulationindices，

6、ispreservedinthepresentofthecriticallycross-correlatedfluctuations．Unexpectedly,thenon-maximalcoherence，whichisestablishedwhenCPTisobtainedfordifferentmodulationindices，issignificantlyenhancedduetothecriticallycross-correlatedfluctuations．Secondly,Wepresentsideband

7、controlofopticalbistabilityandmultistability擘位论文TER‘STHESISromaticelectromagnetic-fieldinducedtransparencyandquantumin—pearanceordisappearanceofthebistabilityandmultistability,manip-ulationofthehysteresishoopwidths，andswitchingbetweenbistabilityandtrista-bilityarea

8、chievedsimplybyvaryingthesidebandamplitudesorthesumofrelativephasesofthesidebandstothecentralcomponent．And，itshouldbenotedthatinourscheme，theopti