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Soviet Journal of Quantum Electronics

Spatial hysteresis and switching waves in thin-film semiconductor interferometers

Sergey P. Apanasevich, Fedor V. Karpushko, George V. Sinitsyn

Published Feb 28, 1985• 4 citations
Publisher

Abstract

An experimental investigation was made of the transformation of the intensity profile of a spatially confined light beam transmitted by optical bistable devices based on thin-film semiconductor interferometers formed by vacuum evaporation. A hysteresis of the intensity profile and switching waves was observed: these waves represented the process of consecutive transition from one stable state to another in neighboring zones of the interferometer. An experimental investigation was made of the velocity of switching waves in thin-film interferometers and in a model interferometer with a thermal nonlinearity.

DOI
10.1070/qe1985v015n02abeh006204

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An experimental investigation was made of the transformation of the intensity profile of a spatially confined light beam transmitted by optical bistable devices based on thin-film semiconductor interferometers formed by vacuum evaporation. A hysteresis of the intensity profile and switching waves was observed: these waves represented the process of consecutive transition from one stable state to another in neighboring zones of the interferometer. An experimental investigation was made of the velocity of switching waves in thin-film interferometers and in a model interferometer with a thermal nonlinearity.
Observations of steady-state hysteresis in absorptive bistability are reported for well-collimated atomic beams of sodium within a traveling-wave interferometer. The atomic medium approximates a system of homogeneously broadened "two-level" atoms, and effects due to standing waves are eliminated. The experiment thus represents the first demonstration of optical bistability under conditions that have been widely employed in theoretical models. Absolute measurements of switching intensities versus atomic cooperativity CCC are reported, and a preliminary comparison with Gaussian-beam theory is made.