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Acta Optica Sinica

Modulation effect of a Bragg acousto-optic bistable system

Ao J

Published Jan 1, 1990• 0 citations
OpenAlex

Abstract

In this paper, the linear stability and the modulation effect of a Bragg acousto-optio bistable system have been analysed. According to the dynamic and stationary equations describing the system, the boundary for instability has been calculated. When the input intensity undergoes a sinusoidal modulation, we predict the resonance and shift of resonance peak of the output intensity in the stable region and the appearance of frequency looking phenomena in the unstable region.

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Physical Review A•Jun 1, 1992•31 citations
In this paper, the linear stability and the modulation effect of a Bragg acousto-optio bistable system have been analysed. According to the dynamic and stationary equations describing the system, the boundary for instability has been calculated. When the input intensity undergoes a sinusoidal modulation, we predict the resonance and shift of resonance peak of the output intensity in the stable region and the appearance of frequency looking phenomena in the unstable region.
Previous research with acousto-optic hybrid optical/electronic (HOE) bistable devices has been directed towards operation in the first Bragg regime.1 We have demonstrated several simulations and experiments to study a HOE bistable system in the second Bragg regime. In this bistable system, the acousto-optic device operates in the second order with the light incident at twice the Bragg angle. To achieve optical bistability, the second order diffracted light is detected by a photodetector, amplified with a linear amplifier, summed with a bias voltage, and feedback to the acousto-optic device. The operation of the acousto-optic device can be explained by a set of coupled differential equations. Likewise, the feedback loop can be modeled with a feedback equation. The simultaneous solution of these equations provided our theoretical model. In this talk, we will compare theoretical and experimental results, as well as compare first order and second order operation.
In this paper, some new results of the study on the bistability and the instability of semiconductor optical amplifier are presented, which may be expected to be available to a class of excitonic optical bistable and amplifying systems. For these systems, both saturation and increasing absorptive bistability will product, depending on the competition among the interactions in the medium, especially the nonlinear couplings, and the lasing conditions. Particularly, the output curve appears a novel feature of optical hysteresis, with amplifying effect as well. On the other hand, the instability of the stationary states is investigated by linear stability analyzing. Some new phenomena of 'critical slowing down' are discovered near the relevant critical points, in the dynamic responding course.