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Proceedings Paper

Sound Diffraction And The Optimizing Of Acousto-Optic Modulator Efficiency
Author(s): Jean-Michel Guerin
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Paper Abstract

The sound diffraction profile due to the rectangular electrode of an acousto-optic cell has been computer modeled, with specific attention to the sound profile in the direction orthogonal to light and sound propagation. The profile is uniform only immediately adjacent to the transducer, which is too close for effective light interaction. Effective interaction can occur only when the light beam is at least 1 or 2 millimeters away from the transducer, where the sound field exhibits Fresnel near field fluctuations in sound intensity, corresponding to regions of constructive and destructive interference. The light beam should fit within a region of constructive acoustic interference to optimize the acousto-optic coupling. A deflector requires changing acoustic carrier frequency and therefore changing near-field acoustic profile. The light beam must be located in a region of reasonably uniform sound intensity for all carrier frequencies. A simple experimental method has been developed to test these results, consisting of Schlieren imaging onto a CCD linear array.

Paper Details

Date Published: 12 February 1980
PDF: 8 pages
Proc. SPIE 0200, Laser Recording and Information Handling, (12 February 1980); doi: 10.1117/12.958085
Show Author Affiliations
Jean-Michel Guerin, Xerox Electro-Optical Systems (United States)

Published in SPIE Proceedings Vol. 0200:
Laser Recording and Information Handling
Albert A. Jamberdino, Editor(s)

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