Tunable Acousto-Optic Filter with Improved Spectral Resolution and Increased Aperture.
Patent, Filed 26 Apr 85, patented 11 Aug 87,
DEPARTMENT OF THE AIR FORCE WASHINGTON DC
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A transverse configuration, electronically tunable acousto-optic filter assembly with improved spectral resolution and increased aperture. The crystal prism member is made TeO2 and has a large prism angle i.e., close to 90 degrees. An acoustic prism coupler member made of material with low acoustic velocity such as TeO2, AsS3, 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 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.
- Acoustooptic and Optoacoustic Devices