We have measured the real n(2) and imaginary beta parts of the chi((3)) nonlinear susceptibility in polycrystalline ZnS and ZnSe and its anisotropy sigma in cubic ZnSe near half-band-gap using femtosecond spectroscopy. We obtain values in good agreement with recent studies. The dispersion of n(2) and beta in polycrystalline ZnSe is compared with two- and four-band model calculations. The dispersion of n(2) and beta strongly affects the pulse transmission through thick samples, and has been included in a model that describes the pulse spectrum after self-phase modulation. The chi((3)) nonlinearity allows for both self-phase modulation and cross-phase modulation, and we demonstrate that both effects can efficiently generate squeezed light in semiconductors by four-wave mixing. [References: 24]
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