The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 09, 1976
Filed:
Aug. 30, 1973
Michael J Brienza, Westport, CT (US);
Frederik Weindling, Stamford, CT (US);
United Technologies Corporation, Hartford, CT (US);
Abstract
Either of two beams of coherent light has components which are phase shifted and/or attenuated; the phase shifting is alternatively provided in different embodiments by (a) transmitting the coherent light through a phase plate (which may be of variable opacity); (b) processing the coherent light in a second laser-acoustic delay line through which an acoustic wave has been transmitted, or (c) providing in the laser acoustic delay line two acoustic traveling waves, one of which interacts at the Bragg angle with the coherent light. An interaction at the Bragg angle between either of the light beams and a traveling wave generated in a laseracoustic delay line by an electrical rf signal provides a diffracted light beam having a frequency equal to the sum of the light beam frequency and that of the rf signal. A photodetector heterodynes the two light beams thereby providing a modulated rf signal with phase or amplitude modulation in accordance with the phase shift or attenuation of either of the light beams.