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Abstract

A transverse configuration, electronically tunable acousto-optic filter assembly with improved spectral resolution and increased aperture. The crystal prism member is made of TeO.sub.2 and has a large prism angle (i.e., close to 90 degrees). An acousic prism coupler member made of material with low acoustic velocity (such as TeO.sub.2, AsS.sub.3, or GeAsSe), to avoid total internal reflection of the interface, is bonded in optical contact with a face of the crystal prism member which defines one extreme of the large prism angle, and which is not traversed by a polarized light beam that is transmitted through the crystal prism member and that interacts with a generated, perpendicularly directed, acoustic wave. The use of the acoustic prism couple member, togther with the use of a large prism angle in the crystal prism member, result in high spectral resolution and large aperture of the filter assembly and its desired useability in the infrared region.

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First Claim