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. 19, 1991
Filed:
Oct. 12, 1989
Applicant:
Inventors:
Seiichi Saito, Tokyo, JP;
Yasuhiko Kuwano, Tokyo, JP;
Assignee:
NEC Corporation, , JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02F / ; G02B / ; G02B / ;
U.S. Cl.
CPC ...
350378 ; 350401 ; 350402 ; 350403 ;
Abstract
An optical polarizer/analyzer incorporated in an optical device is formed of an yttrium vanadate represented by the molecular formula of YVO.sub.4, the yttrium vanadate is as large in differential refractive index between an ordinary ray and an extraordinary ray and in optical absorption characteristics as rutile but is smaller in invertion loss than rutile at 1.3 micron wavelength and the yttrium vanadate is easy for producing a rod with a large diameter, so that the optical polarizer/analyzer of the yttrium vanadate is suitable for the component element of an optical device.