12 February 1980 Sound Diffraction And The Optimizing Of Acousto-Optic Modulator Efficiency
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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.
© (1980) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Jean-Michel Guerin, "Sound Diffraction And The Optimizing Of Acousto-Optic Modulator Efficiency", Proc. SPIE 0200, Laser Recording and Information Handling, (12 February 1980); doi: 10.1117/12.958085; https://doi.org/10.1117/12.958085
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