Mr. Dave W. Graves Profile

Dave W. Graves

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Proceedings Article | 1 December 1991 Paper

64 channel acousto-optical Bragg cells for optical computing applications

David Graves

Proceedings Volume 1563, (1991) https://doi.org/10.1117/12.2321737

KEYWORDS: Acoustics, Modulators, Diffraction, Bragg cells, Optical computing, Channel projecting optics, Transducers, Crystals, Acousto-optics, Electrodes

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Matrix - matrix and matrix - vector multiplications can be performed optically using techniques involving a number of spatial light modulator technologies. Acousto-optic modulators offer the advantages of high efficiency and fast reconfiguration times, on the order of several nanoseconds. Recent efforts to reduce the package size of the acousto-optic SLM devices and increase their pertormance characteristics have rendered this approach more attractive to system designers. This paper reports the results of such efforts applied to a 64 channel acousto-optic modulator and a 64 channel acousto-optic deflector that can be used in tandem to optically compute matrix-matrix and matrix-vector calculations. The modulator is placed in the optical path prior to the deflector and is used as the column selector. The deflector can be operated by pulsing the RF signals to produces packets of information along the optical aperture and reimaging the deflector at the detector plane. This method known as Scophony imaging performs the function of row selector and allows true two-dimensional SLM operation from the acousto-optic devices. Specification trade-offs and fabrication issues are covered. Measured performance parameters are summarized.

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