The resonance fluorescence spectrum of an ensemble of two-level atoms driven by two classical, frequency degenerate and noncollinear laser beams is investigated. It has been found that the spatially-averaged resonance fluorescence spectra differ significantly from the spectra of two-level atoms calculated for the single-beam excitation. The differences were noticed in the number of peaks, their positions and shapes and in their dependences on an angle between wave vectors of the incident beams.
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