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Acta Optica Sinica

Acousto-optic optical bistability in different states of acoustic field

Hen Q

Published Jan 1, 1985• 0 citations
OpenAlex

Abstract

Characteristics of A-O optical bistability with different acoustic travelling-wave coefficient a and effects of acoustic field state on the bistability are analysed. It is pointed out that for A-O bistability to be of practical usefulness the acoustic field should have a specific αcoefficient. When α=1 (i.e., pure acoustic standing-wave field) the A-O bistability becomes useless. Experimental results are in agreement with theories.

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Characteristics of A-O optical bistability with different acoustic travelling-wave coefficient a and effects of acoustic field state on the bistability are analysed. It is pointed out that for A-O bistability to be of practical usefulness the acoustic field should have a specific αcoefficient. When α=1 (i.e., pure acoustic standing-wave field) the A-O bistability becomes useless. Experimental results are in agreement with theories.
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Within the framework of the theories of absorptive bistability recently proposed by various authors, the different sets of coupled differential equations describing the steady-state fields inside the Fabry-Perot cavity are solved analytically. Expressions are obtained for the bistability equation, which links the incident and transmitted fields, for different ranges of the mirror transmission coefficient. Comparison is made with the mean-field theory of Bonifacio and Lugiato. Conditions for stationary points in the bistability curve are derived.
From the frequency dependence of the optical transmission characteristics of Raman-Nath acoustic-optic diffraction, the dynamic equations and steady-state solutions of a two-dimensional Raman-Nath acousto-optic bistable system are derived. In this system, feedback is realized by use of a diffracted light beam to control the frequency of the acoustic-optic driver. The curves of light output versus input corresponding to several orders of the diffracted beams are obtained by theoretical analysis. They can all lead to bistability. The amount of hysteresis is a function of the order of the diffracted beam, the bias frequency, and the feedback coefficient. Experimental results are presented and compared with theoretical analyses.