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. 09, 2006
Filed:
Nov. 18, 2004
Kunihiro Takatani, Yamatotakada, JP;
Kunihiro Takatani, Yamatotakada, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A compound semiconductor laser of a III group nitride semiconductor of the present invention includes a first cladding layerof a first conduction type formed on a substrate, an active layerformed on the first cladding layer, a second cladding layerof a second conduction type formed on the active layer, and a buried layerformed on the second cladding layer, the buried layer having an opening portion for constricting a current in a selected region of the active layer, wherein an upper portion of the second cladding layerhas a ridge portion, the ridge portion residing in the opening portion of the buried layer, and the buried layerdoes not substantially absorb light output from the active layer, and the buried layer has a refractive index which is approximately identical with that of the second cladding layer