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:
Aug. 21, 2007
Filed:
May. 20, 2004
Tsutomu Ukai, Okayama, JP;
Tsutomu Ukai, Okayama, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A semiconductor laser device comprises an n-type cladding layermade of ntype (AlGa)InP, an undoped active layerand a first p-type cladding layermade of ptype (AlGa)InP. These layers are successively stacked in bottom-to-top order. The active layerhas a multi-quantum well structure composed of a first optical guide layer of undoped AlGaAs, a layered structure in which well layers of undoped GaAs and barrier layers of undoped AlGaAs are alternately formed, and a second optical guide layer of undoped AlGaAs. The first optical guide layer, the layered structure and the second optical guide layer are successively stacked in bottom-to-top order.