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:
Jul. 14, 2009
Filed:
Sep. 06, 2006
Applicant:
Tadashi Takase, Tokyo, JP;
Inventor:
Tadashi Takase, Tokyo, JP;
Assignee:
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
H01S 5/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor laser element including a ridge extending along a laser output direction of the laser element. The ridge has a central portion, two peripheral portions sandwiching the central portion, and two transitional portions. Window regions that are non-gain regions are located in corresponding peripheral portions. A difference in an equivalent refractive index between the central portion of the ridge and the peripheral portions on both sides is larger than a difference in an equivalent refractive index between the central portion of the ridge and transitional portions on both sides of the central portion in a gain region.