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:
May. 19, 2009
Filed:
Mar. 04, 2005
Susumu Noda, Kyoto, JP;
Eiji Miyai, Kyoto, JP;
Dai Onishi, Kyoto, JP;
Kyoto University, Kyoto, JP;
Rohm Co., Ltd., Kyoto, JP;
Abstract
Providing a surface-emitting laser light source capable of generating a linearly polarized laser light having a single-lobed beam profile that takes the largest intensity value in its central area. A two-dimensional photonic crystal consisting of a plate member with holes arranged in a square lattice pattern is provided on one side of an active layer. The holes are designed so that its plane shape on the emission side (plane 'B') is smaller than that on the active layer side (plane 'C'). The center of gravity of the shape on plane “B” is displaced from that of the shape on plane “C” in the in-plane direction. This design lowers the degree of the in-plane symmetry of the two-dimensional photonic crystal, so that a linearly polarized laser light having a single lobe is obtained.