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We present a theory of dark resonances in a fluorescence of a three-levelatom gas interacting with a polychromatic field of a frequency shifted feedback(FSF) laser. We show that conditions for the resonance observation are optimalwhen the phase relations between the laser spectral components providegeneration of a light pulses train. We study analytically the field broadeningand the light shift of the resonances.

Dark resonances in the field of frequency shifted feedback laser radiation