Theory of optical bistability in the region of exciton resonances

Bohdan M. Nitsovich; C. Yu. Zenkova

doi:10.1117/12.197095

1 April 1995 Theory of optical bistability in the region of exciton resonances

Bohdan M. Nitsovich, C. Yu. Zenkova

Author Affiliations +

Optical Engineering, Vol. 34, Issue 4, (April 1995). https://doi.org/10.1117/12.197095

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.

Citation Download Citation

Bohdan M. Nitsovich and C. Yu. Zenkova "Theory of optical bistability in the region of exciton resonances," Optical Engineering 34(4), (1 April 1995). https://doi.org/10.1117/12.197095

Published: 1 April 1995

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