We consider $N$ two-level atoms in a ring cavity interacting with a broadbandsqueezed vacuum centered at frequency $\omega_{s}$ and an input monochromaticdriving field at frequency $\omega $. We show that, besides the central mode(at $\o$), many other {\em sideband modes} are produced at the output, withfrequencies shifted from $\omega $ by multiples of $ 2(\omega -\omega_{s})$.Here we analyze the optical bistability of the two nearest sideband modes, onered-shifted and the other blue-shifted.
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