Accession Number : ADD013352

Title :   Tunable Acousto-Optic Filter with Improved Spectral Resolution and Increased Aperture.

Descriptive Note : Patent, Filed 26 Apr 85, patented 11 Aug 87,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Chang, I C

Report Date : 11 Aug 1987

Pagination or Media Count : 8

Abstract : 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.

Descriptors :   *ACOUSTOOPTICS, *FILTERS, ACOUSTIC VELOCITY, ANGLES, APERTURES, ASSEMBLY, HIGH RESOLUTION, INFRARED RADIATION, INTERNAL REFLECTION, LIGHT, LOW VELOCITY, OPTICAL PROPERTIES, POLARIZATION, PRISMS(OPTICS), RESOLUTION, SPECTRA, TRANSVERSE, TUNING

Subject Categories : Acoustooptic and Optoacoustic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE