Nonlinear nonreciprocal effects in an isotropic medium for arbitrarily polarized opposite waves

A phenomenological analysis of the nonlinear susceptibility tensor of an isotropic medium is used to show the possibility of existence of nonreciprocal effects in the course of propagation of arbitrarily polarized opposite waves of the same intensity and frequency. A system for producing amplitude and phase nonreciprocal effects is discussed. The dependence of the effects on the polarizations (ellipticities and azimuths) and on the coefficients of nonlinear interaction between the opposite waves is analyzed for small amplitude and phase changes.