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The nonlinear index of refraction and the two-photon absorption coefficient of CdS, ZnSe, and ZnS were measured using the Z-scan technique with 100-femtosecond pulses at 610 nm, 780 nm, and 1.27 μm. The results are in reasonable agreement with measurements made at similar wavelengths with longer pulses. A simple theoretical model accounts for the dispersion of the nonlinearities and confirms their electronic nature.
Krauss et al. (Mon,) studied this question.