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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Dynamical effects in photorefractive Fabry-Perot resonators

T. Tenev, G. Zartov, Rumiana A. Peyeva, Hugo Thienpont A, Irina P. Veretennicoff, Krassimir P. Panajotov

Published Oct 21, 2004• 0 citations
Publisher

Abstract

We investigate polarization and intensity all-optical bi- and tri-stability in interference structures that include both a birefringent LiNbO3 layer of different crystallographic orientations and an absorbing layer. The origin of this multistability is the thermo-optical nonlinearity present in the structures. Regenerative pulsations are demonstrated using the electro-optical and the photorefractive properties of the LiNbO3 crystal. The unstable dynamical behavior is explained heuristically as being due to competing nonlinearities.

DOI
10.1117/12.583034

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We investigate polarization and intensity all-optical bi- and tri-stability in interference structures that include both a birefringent LiNbO3 layer of different crystallographic orientations and an absorbing layer. The origin of this multistability is the thermo-optical nonlinearity present in the structures. Regenerative pulsations are demonstrated using the electro-optical and the photorefractive properties of the LiNbO3 crystal. The unstable dynamical behavior is explained heuristically as being due to competing nonlinearities.
We investigate the dynamical behavior of optical Fabry-Perot resonators consisting of LiNbO3 slabs (x and c cut) that are coated with different (absorbing or lossless) dielectric multilayers deposited on both sides of the slabs. Bistable switching is observed experimentally. The buildup of beam fanning with time leads to destructive interference for a portion of the incident beam, inducing a change in absorption and heating, hence to switching off. As a result, self-pulsations appear whose frequency depends strongly on the input light intensity, the spot size, and the focusing. Switching and self-pulsations are not observed in the case of lossless coatings or for bare LiNbO3 slabs, although strong photorefractive beam fanning is still present. We also study the influence of the incident-beam characteristics (width and focusing) on the beam-fanning process and the pulsating behavior.
Our work concerns the study of the effect of the optical bistability and multistability in a laser saturable absorber of a Fabry Perot resonator with a homogenous widening. We theoretically studied the influence of the losses of the resonators on the optical bistability by examining mainly the cases where the losses of the resonator depend on the position of the emitted mode of a frequency and the losses of the resonator depend on the density of photons We examined the influence of the physical parameters of laser saturable absorber such as the coefficient of saturation and pumping of the medium active and absorbing on the density of the photons for each loss We showed the effect of the optical bistability and multistability then we analyzed the linear stability of the solutions obtained.