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. 12, 2009
Filed:
Jul. 18, 2007
Applicant:
Tsutomu Ukai, Okayama, JP;
Inventor:
Tsutomu Ukai, Okayama, JP;
Assignee:
Panasonic Corporation, Osaka, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01L 21/28 (2006.01); H01L 21/3205 (2006.01);
U.S. Cl.
CPC ...
Abstract
A semiconductor laser device includes 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.