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:
Nov. 02, 2004
Filed:
Jan. 14, 2003
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
There is provided a semiconductor laser device, which has an oscillation wavelength that is greater than 760 nm and smaller than 800 nm, high reliability, long operating life and a high output, and an optical disk reproducing and recording apparatus that employs the semiconductor laser device. At least first and second lower clad layers and , a quantum well active layer constructed of well layers and barrier layers, first and second upper clad layers and are laminated on a GaAs substrate . The well layer is made of InGaAsP. The well layer has a great layer thickness d of 160 Å, and assuming that an optical confinement coefficient in one layer of the well layer is &Ggr;, then &Ggr;/d is set at a great value of 2.2×10 Å .