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:
Jun. 02, 1992
Filed:
Aug. 21, 1991
Applicant:
Inventor:
Hideaki Kinoshita, Yokohama, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 46 ;
Abstract
A semiconductor laser including a semiconductor substrate having a high resistance region at both ends, an active layer sandwiched between two clad layers, and a window structure having both end surfaces facing each other. Each of the both end surfaces includes end portions of the active layer and the two clad layers, respectively. Since each of the end portions is disposed above the high resistance region of the semiconductor region of the semiconductor substrate, it has a band gap higher than an internal portion of the active layer and the two clad layers, respectively, thereby providing an improved window effect.