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Saturation of band-gap resonant optical phase conjugation in HgCdTe

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Abstract

The saturation behavior of band-gap resonant optical nonlinearity is studied by degenerate four-wave mixing experiments at 10.6 μm in HgCdTe over a wide range of laser intensities. The reflectivity clips at a constant level when the laser intensity is increased above 100 W/cm2, and the corresponding effective third-order nonlinear susceptibility drops as the inverse of the laser intensity. A theory based on the saturation of the interband absorption at the pump frequency resulting from state blocking is presented and agrees well with the experiment.

© 1983 Optical Society of America

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