Fluorescence and absorption spectra of the Λ-system in the case of Raman resonance

Analytic formulas are obtained that describe the fluorescence and absorption spectra of the Λ-system in the case of Raman resonance for unequal intensities of the fields and nonzero one-photon detuning in the rotating wave approximation in the limit of the saturating field. It is shown that, along with a group of Lorentzian lines, the spectra contain an alternating non-Lorentzian part caused by the quantum specificity of the dynamics of the Λ-system, which is of fundamental importance for an adequate explanation of important physical features, such as the decay of spectral line wings, the position of maxima of spectral lines, and the behavior of the absorption coefficient of a probe field near laser frequencies. The relation between theoretical models describing the stationary and nonstationary dynamics of formation of the response of individual atoms is considered, and the possibility of the universal use of the phenomenological stationary model is substantiated