Abstract

The interaction of a single two-level atom with the electromagnetic field inside an optical parametric oscillator gives rise to interesting and complex features in the fluorescent spectrum and transmitted spectra. In the weak driving-field limit the system can be thought of as one atom and an optical cavity driven by an occasional pair of correlated photons. Equivalently, these correlated pairs of photons can be viewed as a source of weakly squeezed light incident on an atom in a cavity. It is in this limit that we treat the problem, and find for one parameter regime sub-natural linewidth spectral features which persist although the system interacts with only one pair of photons at a time (i.e. the squeezing parameter N tends toward zero). For other parameter regimes “vacuum Rabi” doublets with holes, and peaks at zero offset frequency are found.

© 2000 IEEE