P-p'-dioxydiphenylsulpfone, p-nitro--p'-methylbenzylidenaniline, 3-metoxy-4--oxybenzaldehyde crystals are obtained of high optical quality. Refraction index dispersion, nonlinear susceptibility tensor components values, symmetry classes are determined. It is shown that the crystals posses high nonlinear susceptibility along with wide range of transparency and high laser damage threshold. A new method is considered of nonlinear susceptibility measurements.

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The results of the tests for the second harmonics generation in powders of halogenosubstituted mtrodiphenyls are presented. The 4,4'-iodine-nitrodiphenyl single crystals have been grown from a solution, their linear and nonlinear optical characteristics have been measured. The Miller's constant for this crystal is one of the largest among investigated as far as we know.