Accession Number : ADD007985

Title :   Acoustooptical Transducer.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Shajenko,Peter

Report Date : 12 Feb 1980

Pagination or Media Count : 4

Abstract : An acousto-optical transducer which includes a pair of mirrors of high reflectivity arranged in parallel to form an etalon is described. A laser beam enters the etalon at a small angle of incidence through a window and after suffering many reflections at the etalon mirrors exits at the second window. The reflected beam carries the information imposed by an acoustic pressure wave which affects the position of the etalon mirrors. The reflected laser beam of changed frequency due to the doppler shift caused by the motion of the etalon mirrors relative to the source of the incident laser beam is then used to beat with a light of a fixed frequency by using the heterodyne technique. Alternatively, an additional mirror is used which is generally perpendicular to the etalon mirrors and facilitates the reflections at the etalon mirrors for the ultimately reflected beam. (Author)

Descriptors :   *Patents, *Acoustooptics, *Electroacoustic transducers, Surface waves, Laser modulators, Data processing, Laser beams, Mirrors, Acoustic waves, Optical communications, Signal processing

Subject Categories : Acoustic Detection and Detectors
      Optical Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE