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. 28, 2010
Filed:
Mar. 17, 2009
Toru Takayama, Hyogo, JP;
Koichi Hayakawa, Okayama, JP;
Tomoya Satoh, Osaka, JP;
Masatoshi Sasaki, Okayama, JP;
Isao Kidoguchi, Hyogo, JP;
Toru Takayama, Hyogo, JP;
Koichi Hayakawa, Okayama, JP;
Tomoya Satoh, Osaka, JP;
Masatoshi Sasaki, Okayama, JP;
Isao Kidoguchi, Hyogo, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A semiconductor laser device includes an n-type clad layer, an active layer, and a p-type clad layer having a ridge and wing regions. The wing regions are provided with a first trench present on one side of the ridge and a second trench provided on the other side thereof being interposed therebetween. A reflectivity Rf at a front end face of a resonator, a reflectivity Rr at a rear end face of the resonator, a minimum value Wof a width of the first trench in a region adjacent to the front end face, a minimum value Wof a width of the second trench in the region adjacent to the front end face, a width Wof the first trench at the rear end face, and a width Wof the second trench at the rear end face satisfy Rf<Rr, W<Wand W<WA width Wf of the ridge at the front end face, and a width Wr of the ridge at the rear end face satisfy Wf>Wr. The ridge includes a region where a width decreases with distance from the front end side toward the rear end side.