OFF-RESONANT SQUEEZED VACUUM EFFECTS ON A DRIVEN 2-LEVEL ATOM - ABSORPTION AND INTENSITY HARMONICS

The resonance fluorescence system of a coherently driven two-level ato m in the presence of a broadband squeezed vacuum field whose central f requency is not in resonance with either the driving field frequency o r the atomic transition frequency is analyzed. Solutions of the Bloch equations of the system are presented in terms of continued fractions for arbitrary strength of the coherent driving field. Numerical result s are presented for the first-harmonic quadrature components of the ab sorption spectrum and the fluorescent intensity. The effects of the sq ueezed vacuum field detuning on the absorption spectrum result in hole burning or a dip structure in the weak-field case and two absorption- amplification peaks in the strong-field case. Results are sensitive to the relative phase of the squeezed vacuum.