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Examination of optoelectronic feedback effect on collinear acousto-optic filtration

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Abstract

An optoelectronic system containing a collinear acousto-optic cell and positive electronic feedback was examined. The feedback signal is formed due to the optical heterodyning effect in an unconventional regime of collinear acousto-optic diffraction. It is shown that the feedback circuit electrical parameters enable control of the spectral characteristics of the acousto-optic cell, resulting in enhancement of the maximal spectral resolution, the spectral contrast of the system, and the accuracy of optical wavelength determination. The examined optoelectronic device may be treated as an optical radiation spectrum analyzer since the spectrum of the electric signal in the feedback circuit is determined by the light spectrum on the system optical input. It is shown that the examined system may operate in more than one mode—the regeneration mode and the generation mode. The borders between the operation modes were examined both theoretically and experimentally.

© 2018 Optical Society of America

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