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. 23, 1982
Filed:
Jan. 18, 1980
Applicant:
Inventor:
Isamu Sakuma, Tokyo, JP;
Assignee:
Nippon Electric Co., Ltd., Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 45 ; 357 17 ; 372 48 ;
Abstract
A semiconductor laser is provided with a semiconductor substrate having a longitudinal groove formed therein. A first cladding layer is formed on the substrate by an epitaxial process which partially fills in the groove. A waveguide layer is provided atop the first cladding layer, the waveguide layer having either a plano-convex or concave-convex configuration and being thicker at its central region than at its outward edges. An active layer and a second cladding layer are laid over the waveguide layer, whereby the first and second cladding layers serve to confine the laser light within the waveguide layer.