Abstract
We theoretically investigate polarization and intensity all-optical bi- and tri-stability in interference structures that include both a birefringent LiNbO 3 layer of varying crystallographic orientation and an absorbing layer. The origin of this bi- and multistability is the thermo-optical nonlinearity present in the structures. Electrically induced bistable response, electrical control of the bi- and tristable action and regenerative oscillations are demonstrated using the electro-optical and the photorefractive properties of the LiNbO 3 crystal. The unstable dynamical behaviour is explained heuristically as the result of competing nonlinearities. We also observed a mirror image of the multistable curve for specific angles of the obliquely incident input beam.
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