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Optics and Spectroscopy

Self-switching in an optical bistable scheme without a resonator but with additional side feedback

Vyacheslav A. Trofimov, Andrey Shobukhov, A. S. Makarik

Published Sep 1, 1999• 0 citations
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Optically bistable scheme with multiple lateral feedbacks

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We study an optically bistable scheme based on increasing absorption and equipped with multiple lateral feedbacks. These loops appear as a result of partial feeding of the output beam back into the semiconductor crystal through its side surface perpendicularly to the input beam. The cases of one-photon and two-photon absorption are considered. Using the mathematical model of the device we demonstrate bistability and compare two possibilities of switching from one steady state to another. We propose a technique which allows approximately fivefold reduction of the switching time and a decrease of energy consumption as compared with the existing devices based only on the increasing absorption.

Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE•Nov 18, 2003•0 citations
An optically bistable absorption system involving several feedback loops formed by the lateral supply of a fraction of light energy passed through a semiconductor with single-and two-photon absorption is analyzed. It is shown that multistability can be realized in the case of two-photon absorption. The use of several loops makes it possible to significantly reduce energy expenditures on switching and to reduce the switching time by approximately a factor of 10. A method of switching the system from one state to another by varying the reflectivities of side mirrors is proposed.
We consider an optically bistable scheme based on growing absorption and equipped with an additional lateral feedback loop. Mathematical model of this device is proposed and analyzed. We demonstrate the simultaneous transfer to instability of steady states that belong to upper and lower branches of the bistable media characteristic curve. This stability loss may cause either self-switching of the scheme from one steady state to another or generation of autooscillations. The latter may be used for the formation of pulse sequences with given duration. We show that adding several loops instead of one sufficiently decreases the input intensity, necessary for switching. The role of diffusion processes in pulse formation is discussed, and the spatially non-uniformal stationary solutions are demonstrated.
We study an optically bistable scheme based on increasing absorption and equipped with multiple lateral feedbacks. These loops appear as a result of partial feeding of the output beam back into the semiconductor crystal through its side surface perpendicularly to the input beam. The cases of one-photon and two-photon absorption are considered. Using the mathematical model of the device we demonstrate bistability and compare two possibilities of switching from one steady state to another. We propose a technique which allows approximately fivefold reduction of the switching time and a decrease of energy consumption as compared with the existing devices based only on the increasing absorption.