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. 05, 2005
Filed:
May. 28, 2003
Shunji Yoshitake, Kawasaki, JP;
Toshiyuki Terada, Kawasaki, JP;
Akira Tanaka, Yokohama, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A semiconductor laser includes a substrate, a double hetero structure portion formed on the substrate, the double hetero structure including a first clad layer formed on the substrate, an active layer formed on the first clad layer and a second clad layer formed on the active layer, the second clad layer having a stripe-form projection on an upper surface thereof, the projection having an upper portion whose sidewalls are substantially vertically formed on the surface of the substrate and a step-shaped lower portion whose line width is larger than that of the upper portion, and a current blocking layer formed extending from side surfaces of the projection to the upper surface of the second clad layer except an upper surface of the projection.