Nondegenerate optical Kerr effect in semiconductors

We calculate the nondegenerate bound electronic nonlinear refractive index n/sub 2/(/spl omega//sub 1/;/spl omega//sub 2/) (i.e., an index change at frequency /spl omega//sub 1/ due to the presence of a beam at frequency /spl omega//sub 2/) in semiconductors. We calculate this nonlinearity and its dispersion using a Kramers-Kronig transformation on the calculated nondegenerate nonlinear absorption spectrum due to two-photon absorption, electronic Raman and optical Stark effects. The calculated n/sub 2/ values and their dispersion are compared to new experimental values for ZnSe and ZnS obtained using a 2-color Z-scan.<
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