Abstract
We investigate the absorption and dispersion of a probe field by a two-level atom driven by a strong external field and coupled to a single cavity mode. For moderate atom–field coupling the absorption spectrum contains ultrasharp lines, and the real part of the linear susceptibility changes rapidly at the Mollow sideband frequencies. For large coupling the absorption and dispersion spectra split into multiplets whose structures depend on the photon-number distribution of the cavity field. A large index of refraction accompanied by vanishing absorption is predicted.
© 1995 Optical Society of America
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