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:
Oct. 01, 1991
Filed:
Dec. 22, 1989
Hiroyuki Hosoba, Tenri, JP;
Mitsuhiro Matsumoto, Nara, JP;
Sadayoshi Matsui, Tenri, JP;
Taiji Morimoto, Nara, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A semiconductor laser device is disclosed which comprises a semiconductor substrate having a ridge portion, the width of the ridge portion being smaller in the vicinity of the facets than in the inside of the device; a current blocking layer formed on the substrate including the ridge portion; at least one striped groove formed on the center of the ridge portion through the current blocking layer; and a multi-layered structure disposed on the current blocking layer, the multi-layered structure successively having a first current blocking layer, an active layer for laser oscillation, and a second current blocking layer; wherein at least two side grooves are symmetrically formed on both sides of the center region of the ridge portion with the same width as that of the regions thereof near the facets. Also, disclosed is a method for producing the semiconductor laser device.