PECULIARITIES OF SELF-ORGANIZATION OF SPO NTANEOUS PERIODIC STRUCTURES IN PHOTOSENSITIVE LAYERS

A self-organization of regular spontaneous gratings in thin waveguide photosensitive AgCl - Ag films was studied versus of the angle of inci dence of au inducing P-polarized laser beam under conditions of a tota l internal reflection. It is shown that a variety of the system of spo ntaneous gratings is determined by a parameter rho = k(x)/beta, where k(x) is the tangential component of a wave vector of incident radiatio n, beta is the propagntion constant of waveguide mode. Amongst values of rho are encountered ''magic'' numbers, which either demarcate the s ystems of spontaneous gratings with different wavevectors or promote t he amplification of some gratings at the expense of a decay of others.