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Optical Engineering

Theory of optical bistability in the region of exciton resonances
Author(s): Bohdan M. Nitsovich; C. Yu. Zenkova
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Paper Abstract

An exciton-phonon mechanism for producing cavityless optical bistability is suggested. We consider the influence of the oscillating subsystem of a crystal on the absorption process of a laser wave in the region of exciton frequencies. It is shown that exciton-phonon interaction leads to nonlinear dependence of the absorption coefficient on the density of the exciton gas. The increase of absorption with increasing exciton density, however, is possible only in the frequency region on the long-wavelength tail of the exiton band. As a result, the exciton density of the crystal becomes a hysteresis function of external parameters (intensity of the incident wave, temperature, etc.). We calculate the absorption coefficient of excitons and define the frequency and temperature regions where optical bistability may exist. We analyze different relaxation mechanisms of excitons and explain the experimental results of observing optical bistability in different semiconductor crystals.

Paper Details

Date Published: 1 April 1995
PDF: 7 pages
Opt. Eng. 34(4) doi: 10.1117/12.197095
Published in: Optical Engineering Volume 34, Issue 4
Show Author Affiliations
Bohdan M. Nitsovich, State Univ. of Chernivtsy (Ukraine)
C. Yu. Zenkova, State Univ. of Chernivtsy (Ukraine)

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