The Research On Fluorescence Spectra Of Lambda Three-level Atoms And Condensed Characteristics Of Atom And Light Filed In Cavity

This article discusses the resonance fluorescence spectrum and condensed spec-trum of Lambda three-level atom, one dipole allowed transition of the atom is coupled by an external field and the other is coupled by a resonant cavity. Adjusting the Ra-bi frequency Ω of the classical field、atomic parameters (atom delayγ1、γ2, atom detuning△1、△2)、cavity parameters (cavity delayκ,cavity detuning△c) and thermal average Bose particle number n which describes the circumstance temper-ature, the variation of resonance fluorescence spectrum is considered. The results represent:(1) Rabi frequency Ω of the classical field has influence on both of spec-trum structure and spectrum intensity;(2) If the absolute value of atom detuning△1and△2approach zero, namely there is resonance between classical field and atom the central frequency of atom fluorescence spectrum will be restrained;(3) The intensity of atom fluorescence spectrum decreases as the cavity delay κ increases, super narrow linewidth fluorescence will appear if the value of κ is small enough;(4) When there is resonance between cavity and classical field (the value of△c approach-es zero), the central frequency of atom fluorescence spectrum will be significantly enhanced;(5) thermal average Bose particle number n has obvious influence on atom fluorescence spectrum. If the atom delay γ1is far less than cavity delay κ(γ1<<κ),there will appear condensed state of light field, and the greater of the difference of value, the more ideal the condensed state of light field will be.