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Quantum Electronics and Laser Science Conference

Photorefractive Stark Effect and its Applications

Shimon Weiss, Baruch Fischer

Published Apr 24, 1989• 0 citations
OpenAlex

Abstract

It is shown that nondegenerate photorefractive (PR) two-beam coupling with applied D.C. electric field displays Stark-like effect with gain splitting, broadening and shifting as a function of the frequency difference between the two beams. With optical and electronic feedback optical bistability, instabilities and photorefractive self electro-optic effect device (PR-SEED) are obtained.

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Journal of Modern Optics•Feb 7, 2017•3 citations
It is shown that nondegenerate photorefractive (PR) two-beam coupling with applied D.C. electric field displays Stark-like effect with gain splitting, broadening and shifting as a function of the frequency difference between the two beams. With optical and electronic feedback optical bistability, instabilities and photorefractive self electro-optic effect device (PR-SEED) are obtained.
It is shown theoretically that optical bistability is possible in a self-electro-optic effect device (SEED) with single asymmetric quantum wells because of the blue shift of the optical absorption edge with applied field possible in such structures (in contrast to the normal red shift in symmetric wells). The concept is a simplification of the scheme of J. Khurgin [Appl. Phys. Lett. 53, 779 (1988)] (which uses unequal, opposed pairs of asymmetric wells) and shares the potential advantages of lower loss in the transmitting state and less stringent requirements on the exciton absorption peaks.
One of the most interesting and applicable effects of nonlinear optics is optical bistability. This phenomenon is exhibited by certain resonant optical structures where it is possible to have two stable steady transmission states for the device, depending on the history of the input. Such a bistable device may be useful for optical computing elements as a result of its memory characteristics. Optical bistability behaviour is usually observed by inserting a nonlinear matter inside a Fabry–Perot interferometer. But in this study, it was shown that this can be achieved without the application of any optical resonator. Two laser beams were used to interact with the photorefractive media (doped PMMA polymer) which resulted in the bistability of the intensity of transmitted wave. Feedback was provided by a periodic grating created in the photorefractive polymer PMMA.