Degenerate four-wave mixing in a two-level saturable absorbing medium is
calculated on and off resonance for arbitrary input laser intensities and
absorption coefficients. The maximum efficiency occurs at laser intensities
higher than saturation in an optically thick medium. On resonance, the maximum
efficiency can approach ∼4%, and it can be as large as
25% when the laser is tuned off resonance.
© 1993 Optical Society of America
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