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:
Jan. 16, 2007
Filed:
Mar. 13, 2003
Akira Tanaka, Kanagawa, JP;
Hirokazu Tanaka, Kanagawa, JP;
Yoshiyuki Itoh, Saitama, JP;
Koichi Gen-ei, Chiba, JP;
Akira Tanaka, Kanagawa, JP;
Hirokazu Tanaka, Kanagawa, JP;
Yoshiyuki Itoh, Saitama, JP;
Koichi Gen-Ei, Chiba, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
A high-output semiconductor laser of a real index-guided structure comprises: a first conductive type clad layer; active layer for emitting light by current injection; second conductive type first clad layer; second conductive type second clad layer as a ridge waveguide; current-blocking layer formed in both sides of the second conductive type second clad layer and having a larger band gap than those of the second conductive type first and second clad layers; and second conductive type third clad layer having a mobility enough to guide a current to the second conductive type second clad layer and prevent a flow of a leak current into the current-blocking layer.