2ND-HARMONIC-GENERATION-INDUCED OPTICAL BISTABILITY IN PRISM OR GRATING COUPLERS

We deal with second-harmonic generation in chi((2)) nonlinear-optical resonators such as prism or grating couplers. The theoretical study is performed within the framework of a recently developed coupled-mode a nalysis leading to a set of equations governing the amplitudes of pump and second-harmonic frequency fields. We predict analytically that se cond-harmonic generation in prism or grating couplers may lead to opti cal bistability. We believe this to be the first demonstration of such an effect in chi((2)) optical resonators.