Abstract

The nonlinear refractive-index (n2) spectrum of ZnSe near the band gap (λgap ~ 450 nm) at 77 K was measured for the first time to our knowledge by using self-bending of a pulsed laser beam. The maximum nonlinearity, n2 ~ 1.9 × 10−8 cm2/W, measured by us is anomalously large, which cannot be explained by conventional thermally induced band-gap shrinkage.

© 1990 Optical Society of America

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