3-LEVEL ATOM IN A SQUEEZED VACUUM .2. RESONANCE FLUORESCENCE

The resonance fluorescence of a three-level system is studied in each of its three possible configurations-ladder, lambda and vee-when it al so interacts with broad band squeezed vacua and the applied fields are resonant. We obtain general expressions which apply for any configura tion and do not make use of the secular approximation. Detailed result s are presented which depend upon the degree of squeezing and the sque ezing phase, in addition to the intensities of the applied fields. It is shown that asymmetric spectra may be obtained in certain circumstan ces. These are interpreted in terms of coherent and incoherent transit ions induced by the squeezed fields. We also take the opportunity to a ssess the accuracy of the secular approximation.