Abstract
On the basis of a simple model we discuss the stationary behaviour of a homogenously broadened system of atoms driven by a coherent resonant field. We give an analytical description of bistability both for the transmitted and for the fluorescent light. In particular we predict that the spectrum of the fluorescent light undergoes a first-order phase transition for high density of the atomic system: when the intensity of the input field crosses a critical value the spectrum changes discontinuously from a single narrow line to three widely separated lines which corresponds to a sudden appearance of a large Dynamical Stark Shift.
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