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Technical Physics Letters

Longitudinal multidomain structures formed in an optically bistable system under the action of a collimated annular beam

A. V. Vysloukh, Vyacheslav A. Trofimov

Published Nov 1, 2000• 0 citations
Publisher

Abstract

Several longitudinal domains may form under the action of a collimated annular beam propagating in an optically bistable cavity-free system. The computer simulation of this phenomenon indicates two possible pathways for the domain formation process.
DOI
10.1134/1.1329696

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The possibility of formation of a basic (stationary) and an additional (moving) high-absorption domain in an optically bistable system, based on high absorption, is demonstrated. A semiconductor with the absorption coefficient dependent on the concentration of free charge carriers in the conduction band is considered as a nonlinear medium. Under certain conditions, an optical beam passing through the stationary high-absorption domain acquires an annular profile and, after traveling a certain distance, transforms into a Gaussian beam with an intensity on the axis sufficient to switch the medium-beam system to the upper state. This moving domain periodically disappears and reappears due to diffusion processes.