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:
Aug. 13, 1991
Filed:
Apr. 30, 1990
Applicant:
Inventor:
Karen Liu, Montclair, NJ (US);
Assignee:
International Business Machines Corporation, Armonk, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ; G01B / ;
U.S. Cl.
CPC ...
359589 ; 359885 ; 356352 ;
Abstract
This invention describes a double-pass optical filter having a pair of reflective surfaces with a pair of optical media of different indices of refraction inserted between the surfaces. Light is then passed through the surfaces and through each of the optical media to obtain selected frequencies. This invention also includes a means for varying the distance between the reflective surfaces so as to tune the filer over a continuous range of frequencies. The continuous simultaneous turning of two resonant can be achieved by merely displacing one reflective surface relative to another.