Resonance Fluorescence Spectrum Of (?)-type Three-level Atom In Two-mode Cavity

In recent years,as the main parts of laser field with atom in quantum optics,the study of intense laser field interacting with an three-level atom is widely concerned.The research of resonance fluorescence of three levels atom driven by the laser field occupies very important position.In this paper,based on the model of cascade-type three-level atom,we firstly presented the spectra characteristics in classic field and a single-mode cavity field respectively.The spectra characteristics showing that the field intensity and atten-uation rate had a certain influence in fluorescence spectrum,but in the different frequencies of two fields and atomic attenuation coefficients,it does not exist the phenomenon of side-peak splitting or appearing the sharp peak.The main work of this paper is studying the resonance fluorescence of cascade-type atom in two-mode cavity which is driven by intense laser field.Based on the theory of dressed state and appropriate approximation,the Hamiltonian and the master equation were acquired,and then the Langevin equation,diffusion coefficient and coefficient matrix were cal-culated under the operator of atom and field.Finally,using the Fourier transform to this equation,coefficient and matrix,the expression of fluorescence spectrum and resonance fluorescence of cascade-type three-level atom interacting of laser field were obtained.Meanwhile,the distribution laws of five peaks were clearly analyzed by applying the theory of dressed state.Moreover,by adjusting the classical rabi fre-quency of the driving field and attenuation coefficient of atom,the shifty law of the atomic fluorescence spectrum was observed and summarized.And the results show-ing that the fluorescence spectrum would occur side-peak splitting or narrow down when the rabi frequency of two classical fields or attenuation coefficient of atoms were different.Within the varied parameters,some of fluorescence spectrum is grad-ually disappeared.In addition,the increased coupling factor could enlarge coupling strength between cavity field and atoms,which lead to the appearance of apparent peak split or narrow linewidth enhanced fluorescence in fluorescence spectrum.