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:
Oct. 26, 2004
Filed:
Oct. 26, 2001
Nobuhiro Ohkubo, Ikoma, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
A semiconductor laser device has a quantum well active layer including a well layer and a barrier layer laminated on a semiconductor substrate. The quantum well active layer contains II group atoms such as Zn atoms. The quantum well active layer is so formed that a bandgap of the quantum well active layer in the vicinity of an end surface of a laser resonator is larger than a bandgap of the quantum well active layer inside the laser resonator. The II group atoms contained in the quantum well active layer inside the laser resonator make up for vacancies introduced therein so as to inhibit fluctuation of the bandgap of the quantum well active layer inside the laser resonator and thereby to enhance long-term reliability of the semiconductor laser device.