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:
May. 02, 2006
Filed:
Mar. 13, 2003
Yuichiro Okunuki, Tokyo, JP;
Yuichiro Okunuki, Tokyo, JP;
Mitsubishi Denki Kabushiki Kaisha, Tokyo, JP;
Abstract
A semiconductor laser with a window structure which can emit a light beam with a non-deviated outgoing angle. The semiconductor laser emits a light beam generated at an active layer via a window section. The window section includes a first semiconductor layer having a first carrier concentration and a second semiconductor layer on the first semiconductor layer as an extension of the active layer and which has a second carrier concentration lower than the first carrier concentration. The window section further includes a third semiconductor layer having a third carrier concentration. According to the third layer, a refractive index distribution of the light beam at the window section is symmetrical in the laminating direction, with the extension of the active layer as a center. Because the beam is uniformly propagated, the beam can be emitted without being deviated in the laminating direction.