Abstract

The results of measurements of nonlinear refraction at the absorption edge in InAs between 68 and 90 K taken with an HF laser are compared with those of a band-gap resonant model in which the contribution of the light-hole band is included and found to account for more than 40% of the observed nonlinear refraction. A generalized expression for the nonlinear index is derived by using the complete Fermi–Dirac distribution function. Good agreement between theory and experiment is obtained, with no free parameters.

© 1984 Optical Society of America

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