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. 04, 1992
Filed:
Jul. 13, 1989
Applicant:
Inventors:
Takashi Kajimura, Nishitama, JP;
Naoki Chinone, Hachioji, JP;
Yuichi Ono, Nishitama, JP;
Shinichi Nakatsuka, Kokubunji, JP;
Kazuhisa Uomi, Kokubunji, JP;
Toshihiro Kawano, Hachioji, JP;
Tsukuru Ohtoshi, Kokubunji, JP;
Yasutoshi Kashiwada, Nishitama, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 44 ; 372 45 ; 372 46 ; 372 48 ;
Abstract
A semiconductor laser having a stripe-like lasing region, wherein the structure of the lasing region such as the mechanism of optical guiding of the lateral mode control structure is made different between the central portion in the lasing region and portions close to facets, in order to reduce optical feedback induced noise and astigmatism, and to facilitate the manufacture thereof.