Accession Number : ADD010054

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

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC

Personal Author(s) : Chang,I-Cheng

Report Date : 23 Dec 1982

Pagination or Media Count : 15

Abstract : This document refers to a transverse configuration, electronically tunable acousto-optic filter assembly with improved spectral resolution and increased aperture. The crystal prism member is made of 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 the acoustic prism couple member, together 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. (Author)

Descriptors :   *Patent applications, *Infrared filters, *Tuning devices, *Acoustooptics, Configurations, Polarization, High resolution, Low velocity, Orthogonality, Infrared radiation, Prisms(Optics), Assembly, Laser beams, Transverse, Tuning, Spectra, Optical properties, Light, Acoustic velocity, Infrared lasers, Apertures, Internal reflection, Regions, Filters, Angles

Subject Categories : Acoustics
      Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE