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The dispersion of the quadratic electro-optic (Kerr) constants of KCl crystals containing two substitutional impurities Pb2+ and Cu+ has been determined. The constants (r11,11-R11,22) and R12,12 are reported for the crystals at different concentrations of the impurities in the region 590-290 nm. The observed wavelength dependence is found to be similar to that of the piezo-optical constants of pure alkali halide crystals. The experimental data have been fitted to a simple Sellmeier relation and the dispersion constants are reported.
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