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Philosophical Transactions of the Royal Society of London Series A Mathematical and Physical Sciences

Giant nonlinearities and low power optical bistability in cadmium sulphide platelets

M. Dagenais

Published Dec 18, 1984• 1 citation
Publisher

Abstract

Abstract Both whole-beam and transverse continuous wave optical bistability are observed at milliwatt power levels near the band gap in thin uncoated cadmium sulphide platelets. The whole-beam bistability is free from cavities and requires an absorption coefficient that increases with intensity.
DOI
10.1098/rsta.1984.0105

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The switching dynamics of thermally induced optical bistability due to increasing absorption is investigated in thin CdS platelets, at room temperature. Fast and slow components can be observed during the switching process, they depend on the holding point intensity and on the switching pulse energy. It is shown that the transverse relaxation of the temperature in the sample influences this dynamics. The spectral shift of the band to band absorption edge, at the origin of the bistable behavior, is observed in a three beam experiment.
Self-defocusing of ordinary and extraordinary laser beams have been investigated in cadmium sulfide semiconductors in the near-band-edge absorption region. First it has been shown experimentally, that effects of the anisotropy nonlinear refraction induced by charge carriers created by single photon absorption is described whole set components of the third order nonlinear susceptibility tensor. New type of transverse optical bistability with increased amout of feedback due to nonlinear anisotropy was demonstrated.