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:
Dec. 22, 1998
Filed:
Apr. 15, 1996
Applicant:
Inventors:
Takayuki Matsuyama, Hiratsuka, JP;
Chisato Furukawa, Atsugi, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ; H01L / ;
U.S. Cl.
CPC ...
372 44 ; 372 46 ; 372 50 ; 438 33 ; 438 28 ;
Abstract
In the semiconductor laser element of the present invention, a striped active layer for injecting an electrical current, is formed on the main surface of the semiconductor substrate. A pair of notches for dividing the semiconductor substrate, are made in the main surface of the semiconductor substrate so as to be in parallel with each other interposing the striped active layer. Each of the pair of notches has the ratio between the depth d thereof and a double of the width w, that is 2w, (d/2w), of 1.0 or higher.