Localized optical structures in the scheme of a nonlinear layer with a feedback mirror

An analysis is made of the dynamics of the transverse structure of the fiel d in the scheme of a layer of a medium with nonlinear amplitude-phase trans mittance and a feedback mirror separated from it by a linear spacing. For t he case of small field changes in a single passage, an approximate equation is derived, which is close in form to the equation used in the average-fie ld approximation for nonlinear interferometers excited with external emissi on. For the nonlinearity of threshold type, an analytical form is presented for the field distribution corresponding to localized dissipative structur es (dissitons). (C) 2000 MAIK "Nauka/Interperiodica".