2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/123990We considered the wave propagation between two medias. For description of physical model choose nonlinear Schredinger equation with saturation parameter. The solutions of respectively equation are found and analyzed.4 pages, 3 figuresPattern Formation and SolitonsThe propagation of the light beam at the interface between uniform media and periodic mediatext