Abstract

The second order optical nonlinearity is responsible for second harmonic generation (SHG) and refractive index dependence on intensity.^[1] The latter is dependent on the non-equillibrium carriers concentration, also. All nonlinearities may be influenced by defects if the symmetry of crystals has been changed or the resonant interaction appears.^[2] The dependence of nonlinearities of defects was found in ZnSe with the help of SHG^[3] and nonlinear absorption of light.^[4,5] The light induced difraction (LID) of light, was found very informative for the investigation of optical nonlinearities,^[6] therefore the complex investigation of SHG and LID has been chosen for the investigation of the nature of optical nonlinearities in ZnSe.

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