ENERGY EXCHANGE BETWEEN LIGHT-WAVES IN MEDIA WITH BIPOLAR RESPONSE

The wave interaction in media with the diagonal-bipolar nonlinearity is studied theoretically. The properties of the parametric coupling between the different frequency waves with exciting the dielectric permeability static lattices are discussed. The conditions realizing the effective energy exchange in the region of the crystal optical anisotropy, including the frequency-degenerated interaction, are found. In a general case the amplification of weak waves takes place in the definite range of the pump intensity. The amplification factor is limited as well. However, there exists an interaction geometry removing these restrictions.