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. 11, 2005
Filed:
Apr. 01, 2003
Applicants:
Atsushi Shono, Tokyo, JP;
Hitoshi Hotta, Tokyo, JP;
Hiroyuki Sawano, Tokyo, JP;
Inventors:
Assignee:
NEC Compound Semiconductor Devices, Ltd., Kawasaki, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S 500 ;
U.S. Cl.
CPC ...
Abstract
A semiconductor laser device includes an active layer and first and second current blocking layers having aligned stripe openings for injecting operating current into the active layer in a current injection area. The second current blocking layer has another opening, through which the first current blocking layer contacts an external cladding layer, in the vicinity of the emission facet of the laser cavity to form a current non-injection area. The first current blocking layer and the external cladding layer have a substantially equal refractive index.