OPTICAL BISTABILITY IN CHI((2)) NONLINEAR MEDIA DUE TO CASCADED PROCESS

We present a model calculation of bistable light transmission through nonlinear Fabry-Perot cavity filled with media without a centre of sym metry. The susceptibility tensor of the third rank is assumed as the d ominant nonlinear quantity. The model is based on the cascade-process. Two special cases are considered: interaction of two waves (incoming and its second harmonic) and that of three waves (two incoming beams o f different frequencies and the third beam of difference frequency). T he formulas for the intensity-dependent refractive indices are derived . With appropriately chosen parameters we obtain formulae for the tran smitted intensity, which are analogous to the customary ones for Kerr- like media with symmetry centre.