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:
Aug. 25, 2009
Filed:
May. 18, 2006
Yoshihiro Ueta, Yamatokoriyama, JP;
Teruyoshi Takakura, Tenri, JP;
Takeshi Kamikawa, Mihara, JP;
Yuhzoh Tsuda, Sakurai, JP;
Shigetoshi Ito, Shijonawate, JP;
Takayuki Yuasa, Ikoma-Gun, JP;
Mototaka Taneya, Nara, JP;
Kensaku Motoki, Mino, JP;
Yoshihiro Ueta, Yamatokoriyama, JP;
Teruyoshi Takakura, Tenri, JP;
Takeshi Kamikawa, Mihara, JP;
Yuhzoh Tsuda, Sakurai, JP;
Shigetoshi Ito, Shijonawate, JP;
Takayuki Yuasa, Ikoma-Gun, JP;
Mototaka Taneya, Nara, JP;
Kensaku Motoki, Mino, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Sumitomo Electric Industries, Ltd., Osaka, JP;
Abstract
A nitride semiconductor laser device has a nitride semiconductor substrate that includes a dislocation-concentrated regionand a wide low-dislocation region and that has the top surface thereof slanted at an angle in the range of 0.3° to 0.7° relative to the C plane and a nitride semiconductor layer laid on top thereof. The nitride semiconductor layer has a depression immediately above the dislocation-concentrated region, and has, in a region thereof other than the depression, a high-quality quantum well active layer with good flatness and without cracks, a layer that, as is grown, readily exhibits p-type conductivity, and a stripe-shaped laser light waveguide region. The laser light waveguide region is formed above the low-dislocation region. This helps realize a nitride semiconductor laser device that offers a longer life.