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. 25, 2013
Filed:
Oct. 16, 2009
Masao Kawaguchi, Osaka, JP;
Masao Kawaguchi, Osaka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A semiconductor laser device includes a semiconductor-layer lamination () having an active layer () formed over a substrate (). The semiconductor-layer lamination () includes a front face which emits light, a strip-shaped optical waveguide formed in a direction transverse to the front face, a first region (A) extending in a direction transverse to the front face, a second region (B) having a top surface whose height is different from that of the first region (A), and a planar region (C) formed between the first region (A) and the second region (B), and having periodic surface undulations whose variation is smaller than that of the second region (B). The optical waveguide is formed in the planar region (C).