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:
Feb. 19, 2013
Filed:
Oct. 28, 2011
Shoichi Kawashima, Kawasaki, JP;
Yasuhiro Nagatomo, Kawasaki, JP;
Shoichi Kawashima, Kawasaki, JP;
Yasuhiro Nagatomo, Kawasaki, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A surface emitting laser emitting a laser beam in a single transverse mode irrespective of an emission area while one-dimensionally aligning polarization of the output beam, including a two-dimensional photonic crystal, having resonance modes in directions of the primitive translation vector aand a, lengths |a| and |a| of the primitive translation vectors aand asatisfied |a|=p×(λ/2n), |a|=λ/2ndescribed by a resonance wavelengths λand λin the resonance modes in the aand adirections, effective refractive indexes nand ndetermined by the resonance modes in the aand adirections, an integer p of 2 or more, the resonance wavelengths λand λsatisfy λ≦2×(n/(n+n))×λdescribed by the effective refractive index nand a refractive index nof an external medium located out of the surface emitting laser.