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. 09, 2012
Filed:
Aug. 29, 2008
Susumu Noda, Uji, JP;
Yoshitaka Kurosaka, Kyoto, JP;
Kyosuke Sakai, Kyoto, JP;
Eiji Miyai, Kyoto, JP;
Dai Ohnishi, Otsu, JP;
Wataru Kunishi, Kyoto, JP;
Susumu Noda, Uji, JP;
Yoshitaka Kurosaka, Kyoto, JP;
Kyosuke Sakai, Kyoto, JP;
Eiji Miyai, Kyoto, JP;
Dai Ohnishi, Otsu, JP;
Wataru Kunishi, Kyoto, JP;
Japan Science and Technology Agency, Kawaguchi-Shi, JP;
Rohm Co., Ltd., Kyoto-Shi, JP;
Abstract
A laser capable of emitting multiple laser beams is provided. A two-dimensional photonic crystal laser according to the present invention has a laminated structure including an active layer, a first photonic crystal layer having a periodic distribution of refractive index with a first period, and a second photonic crystal layer having a periodic distribution of refractive index with a second period that differs from the first period. This two-dimensional photonic crystal laser can emit a main beam traveling in a direction perpendicular to the two-dimensional photonic crystals and side beams each traveling in a direction inclined with respect to the main beam. These beams can be used, for example, in a recording/reproducing device by means of an optical disk, the main beam being used for recording/reproducing information and the side beams for following up the track.