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:
Jan. 30, 1990
Filed:
Apr. 27, 1988
Nathan T Melamed, Pittsburgh, PA (US);
Richard A Elco, Upper Allen Township, Cumberland County, PA (US);
Westinghouse Electric Corp., Pittsburgh, PA (US);
Abstract
A method and apparatus for improving the bandpass characteristic of an acousto-optic tunable filter in which two optically birefringement crystal parts are oriented so that their respective optic axes are tilted with respect to each other. The amount of tilt as well as the angle of incidence to the first part is selected so as to subject the light to a first bandpass characteristic in a first part of the crystal and a second bandpass characteristic in a second part of the crystal such that the bandpass characteristics have a common center frequency. When the bandpass characteristics have a ratio of 1.5, sideband suppression is significantly improved.