The optical self-reflection in a naive model of a semi-infinite nonlinear m
edium is studied theoretically. It is demonstrated that a Fabry-Perot reson
ator is induced by a propagating wave in the medium if the incident intensi
ty exceeds a critical value. Hysteresis dependences of the reflectivity and
the resonator length on the incident intensity are predicted. (C) 2000 MAI
K "Nauka / Interperiodica".