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:
Jul. 25, 1989
Filed:
Feb. 16, 1988
Motohito Hino, Nagoya, JP;
Yoshinori Bessho, Mie, JP;
Abstract
An optical system for producing an optical output having a beat frequency. The shifter has a beam splitter for splitting a laser radiation generated by a laser source, into a first and a second laser beam, and includes an acoustooptical modulator for deflecting the first laser beam and thereby changing the frequency of the first laser beam. The shifter further has an optical-path changing device such as a convex lens or parabolic reflector for changing an optical path of the first laser beam deflected by the acoustooptical modulator, into parallelism with the optical axis of the changing device. The focal point of the optical-path changing device is located at a point of emission of the deflected first laser beam. A mixer is provided for mixing the deflected first laser beam with the second laser beam, thereby causing an interference between the first and second laser beams, to produce a beat frequency equal to a difference between the frequencies of the first and second laser beams.