Publication # 011

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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