||D. A. B. Miller, S. D. Smith and B. S.
Wherrett, "The Microscopic Mechanism of Third-Order Optical Nonlinearity in
InSb," Optics Commun. 35, 221-226 (1980).
Microscopic models are
proposed for the bandgap-resonant low intensity nonlinear refraction observed in InSb by
Miller et al. (1979) predicting the self-defocusing deduced from beam patterns. The
physical arguments differ from earlier treatments of third-order nonlinearity in
semiconductors by explicitly including excitation and saturation effects, and can explain
the exceptionally large experimental value of chi /sup (3)/ approximately 10/sup -2/ esu.
The results are consistent with observations of optical bistability, two-beam differential
gain and degenerate four wave mixing
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