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Canadian Journal of Physics

Bistability, optical regenerative oscillations, and chaos in an integrated acoustooptic device

Hubert Jerominek, Claude A. Delisle, J. Y. D. Pomerleau, Réal Tremblay

Published Feb 1, 1985• 9 citations
Publisher

Abstract

Optical bistability experiments have been performed using an integrated acoustooptic modulator by making use of a surface acoustic-wave delay line in the feedback loop. Different experimental results are reported, including optical hysteresis, differential gain, and oscillatory behaviour. Possible modifications of the acoustooptic integrated bistable device are also proposed.

DOI
10.1139/p85-037

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Optical bistability experiments have been performed using an integrated acoustooptic modulator by making use of a surface acoustic-wave delay line in the feedback loop. Different experimental results are reported, including optical hysteresis, differential gain, and oscillatory behaviour. Possible modifications of the acoustooptic integrated bistable device are also proposed.
Over the past decade, research with acoustooptic hybrid bistable devices has been primarily concerned with operation in the first Bragg regime involving two to four diffracted orders. In this paper, a model that includes both acoustooptic diffraction and nonlinear feedback will be used to investigate optical bistability in the second Bragg regime. In addition, theoretical simulations will be used to compare this system with an identical system operating in the first Bragg regime. Theoretical and experimental results will be presented.
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 we report for the first time the presence of bistability in an acoustic-optic tunable filter (AOTF) operating with ultrashort (2 ps) optical light pulses. The results for the study of bistability has shown the dependence of the hysteresis curve with the product of the coupling constant (κ) by the length of the device (ξL) and the conversion power-coupling constant factor (G). The range of bistability varies significantly with both G and with κξL parameters. The variation of κξL directly increases the size of the range of bistability hysteresis while the increase in G causes the bistability to occur at low powers. The phenomenon of optical bistability (OB) is the object of increasing interest due to its possibilities for important device applications. A bistable device is a device with a capability to generate two different outputs for a given input and the physical requirements for this are an intensity-dependence refractive index and an optical feedback mechanism.