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1、萬方數(shù)據(jù)AbstractThisthesisfocusesonprofoundstudyofsub··intrinsic—-linewidthspectroscopyinElectromagnetically-InducedTransparency(Coherent-PopulationTrapping)system．Thisspectroscopicmethodselectszero-time—lagcross—correlationg¨’(0)betweentheconvenedamplitudefluctuationsfromlaserphase
2、noise(phaseorfrequencymodulation，intrinsicphasenoiseoflaser)interactingwitllatomsastheobservable．Obtainingnarrowspectrumhassignificanceinimprovingaccuracyofmeasurements，timeandfrequencystandardsinspectroscopyandprecisionmeasurements．Thelargenonlinearcoherencebetweenthetwogrounds
3、tatesinEIT(CPT)systemistheorigintobothOursub-intrinsic—linewidthspectroscopictechniqueandquantumcorrelation，andOurstudyinsemi-classicalregimepavedthewayforinvestigationtowardquantumcorrelation．InChapter2，theoriesofatomicresponseandcross-correlationg‘2’(O)arederived、Ⅳimdifferentf
4、requency(phaselnoisesourcesincludinglaserphasemodulation，frequencymodulationandintrinsicphasenoiseinEIT(CPT)system．Itpredictedthesub．intrinsic-linewidthandpower-broadening-freespectrumofcross．correlation．Besides，theinfluencesfromasymmetryofinteractingfieldsandresidualamplitudemo
5、dulationarediscussed，whichcausebothlineprofilereshapingandlinebroadening．Demonstrationofresolutioninmultiple·Asystemusingg‘孫(0)techniqueshowsitspotentialapplicationinspectroscopyandsensing。InChapter3，experimentscorrespondingtothetheoriesaresummarized．First，inZeemanEIT,thenonline
6、arspliaingisconfm-nedandobservationsofg‘2’(0)spectralwithmodulationsusingbothelectroopticmodulatorandpiezoceramicsoflasershowedsub．intrinsic．1inewidthfeature．LinewidthasafunctionoflaserpowerandmodulationparameterscoincideswiththeoryinChapter2remarkablyandthenarrowestwidthachieve
7、diS1／30oftheintrinsicwidth．Theobservedg¨’(0)spectrumwithintrinsiclaserphasenoisealsoshowedgreatagreementwiththeory．Besides，thecapabilityofresolvingmultiplelinesWasinvestigatedinahyperfineEIT．Chapter4summarizesimportantresultsfromthiswork。DiscussionsaboutatomicresponseinRabireson
8、anceandsub．Hertzspectrumincoatedcellbeyondt11iS
