OPTICAL-RESPONSE OF NONLINEAR PLANAR RESONATORS UNDER PULSED-BEAM EXCITATION - COMMENT

In a recent paper [Phys. Rev, B 46, 7632 (1992)], Peschel and Lederer consider a nonlinear planar resonator filled by a negative Kerr medium which is local but not instantaneous. In this Comment, we show that t he loops reported by Peschel and Lederer, for large oblique incidence, do not correspond to bistable cycles. Indeed the noninstantaneous res ponse of the nonlinear material and the dynamics of the fields do not lead to the feedback mechanism required for optical bistability.