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Optics and Spectroscopy

Light-induced bleaching of an optically inhomogeneous medium and optical bistability

Sergei M. Arakelyan, A. S. Karayan, Yu. S. Chilingaryan, A. V. Egibyan

Published Aug 1, 1986• 0 citations
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An analysis is made of the main laws governing the propagation of opposite waves in a randomly inhomogeneous medium with a cubic refraction nonlinearity with respect to the field, allowing for interference. It is shown that, in spite of modulation of the optical intensity as a result of interference between the opposite waves, almost complete bleaching of a heterogeneous medium can be achieved for fairly large scattering particles. An analysis is made of an optical resonator filled with a randomly inhomogeneous nonlinear medium and the conditions for bistability are determined. It is established that a considerably lower Q factor than in similar devices using nonlinear absorbers is sufficient to achieve bistability in this resonator.
Optical bistability in a Fabry-Perot cavity filled with nonlinear riedium possessing reversible bleaching under illumination by two light beams having different wavelengthes is considered theoretically. The erIiancement of optical feedback efficiency is shown to take place when simultaneous intensity changes of light waves have opposite signes. Analytical solution is obtained in a low absorption limit showing that the optical bistability can be realized with four times greater level of background losses as compared with the conventional case.