Possible mechanisms of nonlinear optical activity (NLOA) in crystals connected with electronic nonlinearities are considered in this work . Relations are obtained that describe nonlinear changes in the structure of light polarization in a medium having weak, arbitrary nonlinearity . It is shown that in media with third-order nonlinearity, NLOA may be linked either with the distribution of nonlinearity in the medium or with the anisotropy of nonlinear absorption-so-called absorptive and dispersive NLOA .
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