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Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE

Laser Spot Size Dependence, Nonlocality And Saturation Effects In Transverse Optical Bistability

I. C. Khoo, T H. Liu, Ping Yan, Jingya Hou

Published Oct 14, 1986• 1 citation
Publisher

Abstract

We present here a theoretical discussion of the effect of nonlocality and saturation in transverse optical bistability. It is found that the switching conditions, switching power and characteristics are considerably different from the situation where these effects are not accounted for. We also include an analytical study of the transverse self-phase modulation effect and relate the key parameters explicitly to the transverse bistability switching condition and bistability.

DOI
10.1117/12.938871

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We present here a theoretical discussion of the effect of nonlocality and saturation in transverse optical bistability. It is found that the switching conditions, switching power and characteristics are considerably different from the situation where these effects are not accounted for. We also include an analytical study of the transverse self-phase modulation effect and relate the key parameters explicitly to the transverse bistability switching condition and bistability.
Recently, a new class of optical bistability, involving transverse self-phase modulation effect with a single reflection feedback, has been demonstrated. We present here a detailed theoretical calculation of the effect of saturation and nonlocality on the switching behavior and power. The technique employed is similar to that given in a recent paper but generalized to the case where the nonlinear refractive-index change contains a saturation parameter. It is found that both the switching powers and the hysteresis loops are considerably changed. Multiple close-by switching loops occur. Because of the extreme sensitivity of the transverse bistability switching on the width of the transverse nonlinear phase shift, we have also investigated the effect due to nonlocal response of the thin film subjected to a Gaussian laser beam. Specific detailed calculations were performed for nonlinear thin film where such nonlocal behaviors are expected (e.g., liquid crystal reorientation and diffusive processes in semiconductors). The most prominent result is that a more accurate prediction of the switching intensity is obtained if the nonlocal effects are included.
We present a theoretical study, with reference to experimental results, of transverse self-phase modulation effects in the transmission of a laser beam through a nonlinear thin film. The occurrence of interference rings, intensification or dimming of the on-axis beam intensity, and transverse optical bistability in the presence of a feedback can all be systematically documented in terms of geometrical/optical parameter classifications. These studies provide further insights and useful guides for experimental studies.
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