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Soviet Journal of Quantum Electronics

Optical bistability and hysteresis in a reversed wave in the course of degenerate six-photon interaction in cadmium sulfide

Anatoly A. Borshch, М. С. Бродин, V. I. Volkov, N V Kuktarev

Published Jun 30, 1981• 5 citations
Publisher

Abstract

Nonresonator optical bistability and hysteresis in a wave with a reversed wavefront were observed for the first time because of degenerate six-photon scattering in a CdS crystal. The observations were interpreted theoretically and a forecast was made of the conditions for the observation of these effects in a medium with a nonlinearity of fifth order in respect of the field.

DOI
10.1070/qe1981v011n06abeh007048

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Nonresonator optical bistability and hysteresis in a wave with a reversed wavefront were observed for the first time because of degenerate six-photon scattering in a CdS crystal. The observations were interpreted theoretically and a forecast was made of the conditions for the observation of these effects in a medium with a nonlinearity of fifth order in respect of the field.
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.
Optical bistability in the presence of an optically induced absorption is observed when a thin 13-μm CdS sample is inserted between two mirrors of 90 % reflectivity, in our experiment, a modulated cw laser of ~15-mW peak power is tuned on each side of the free exciton resonance in CdS, and the transmission characteristics are studied. A theoretical calculation including both absorptive and dispersive effects is presented and good agreement is obtained. The absorption coefficient and the index of refraction of the material are connected by Kramers-Kronig relations. Propagation effects are taken into account. Sufficiently long pulses (40 ms) are considered to allow the thermally induced absorption to occur. For detunings above the free exciton resonance, we predict that counterclockwise hysteresis loops will first be observed as the intensity rises; for detunings below the free exciton resonance, only clockwise hysteresis loops are predicted. These predictions were experimentally verified. Power levels of the order of 5–10 mW were sufficient to observe bistability. Cavity effects were also observed.