ASYMMETRIC 2-LEVEL RESONANCE FLUORESCENCE-SPECTRA AND DRESSED STATE POPULATIONS IN A SQUEEZED VACUUM

We calculate the resonance fluorescence of a two-level atom interactio n with a resonant classical applied field and a squeezed vacuum for ge neral values of the squeezing phase. We find that the spectra am asymm etric under the conditions: (i) the Rabi frequency must not be too lar ge and (ii) the squeezing phase should be of order pi/2. Large asymmet ries are obtainable, even if the three peaks of the spectrum are clear ly resolved. An interpretation is provided by means of a dressed state analysis. Under conditions (i) and (ii). we also find that very large differences in the dressed state populations can occur.