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:
Apr. 04, 1989
Filed:
Oct. 06, 1987
Jan Opschoor, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A semiconductor laser having a layer structure including a first and a second passive layer of opposite conductivity types, an active layer therebetween which forms a pn junction with one of the passive layers, and a current-limiting blocking layer which forms a reverse-biased pn junction bounding a radiation emitting active region of the active layer. The active region has a thickness which exceeds that of the remainder of the active layer, and extends through the blocking layer at least as far as the other passive layer. This achieves effective electrical and optical confinement of the active region, enabling a sufficiently low threshold current for laser operation at room temperature.