Abstract
The numerically computed 'physical spectrum' of light scattered near the collisionally perturbed S0-P1 resonance is presented. The authors assume that the strong laser pulse is rectangular, and apply the dressed-atom approach generalized to time-dependent processes. The influence of the interferometer of bandwidth Gamma on the obtained spectra is discussed. The authors show that Gamma either small or large affects the spectra strongly, thus distorting the information about the atomic system.