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:
Sep. 12, 1989
Filed:
Aug. 29, 1988
Applicant:
Inventor:
Teunis Van Dongen, Eindhoven, NL;
Assignee:
U.S. Philips Corp., New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S / ;
U.S. Cl.
CPC ...
372 46 ; 372 45 ;
Abstract
A semiconductor laser of the double hetero-junction type has a current-limiting buried blocking layer with a second active layer and an additional passive layer provided above the first layer. As a result, the threshold current required for laser operation is less strongly dependent upon temperature. At the same time, the radiation intensity versus current strength characteristic of the laser above the threshold current is substantially straight, without the presence of 'kinks'.