Effects of signal detuning on phase conjugation.
The formulations of degenerate three-wave and four-wave phase conjugation are generalized to include signalpump detuning. The theory is an extension of grating-dip spectroscopy. The reflection bandpass is shown to be limited by the power-broadened bandwidth (proportional variant 1/T(1)) of the two-level population difference. Unlike for runningwave saturation, the signal-absorption coefficient saturated by a standing wave shows virtually no gain regions.
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Optical Sciences Center, University of Arizona, Tucson, Arizona 85721, USA.
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