New nonlinear intensity Kerr effect in the polar geometry

The problem of the electromagnetic wave reflection on the second optical ha rmonic from a semi-infinite optically isotropic magnetic medium is consider ed for the uniform magnetization direction corresponding to the polar Kerr effect. In the first approximation in magnetization, the method of Green's tensor functions is used to derive expressions for the complex amplitudes o f the wave fields for the incidence of s- and p-polarized waves (as well as of their superposition) on the medium. It is shown that, in the latter cas e, the nonlinear polar Kerr effect is of the intensity type. The dependence s of the intensity effect on the angle of incidence of the inducing wave an d on the angle of its polarization, which were obtained in numerical experi ments, are presented. A comparative analysis of the linear and nonlinear in tensity Kerr effects is carried out. (C) 2000 MAIK "Nauka/Interperiodica".