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. 20, 2019
Filed:
Aug. 25, 2016
Kyoto University, Kyoto-shi, Kyoto, JP;
Rohm Co., Ltd., Kyoto-shi, Kyoto, JP;
Hamamatsu Photonics K.k., Hamamatsu-shi, Shizuoka, JP;
Mitsubishi Electric Corporation, Tokyo, JP;
KYOTO UNIVERSITY, Kyoto, JP;
ROHM CO., LTD., Kyoto, JP;
HAMAMATSU PHOTONICS K.K., Hamamatsu, JP;
MITSUBISHI ELECTRIC CORPORATION, Tokyo, JP;
Abstract
A two-dimensional photonic-crystal surface-emitting laserincludes: a two-dimensional photonic crystal (two-dimensional photonic crystal layer) including a plate-shaped base bodyhaving a predetermined size in which modified refractive index areaswhose refractive index differs from the base body are periodically arranged in a two-dimensional pattern; an active layerprovided on one side of the two-dimensional photonic crystal; and first and second electrodesandfacing each other across the two-dimensional photonic crystal and the active layer, for supplying an electric current to the active layer. The modified refractive index areasare provided in such a manner that the in-plane occupancy of those areasin the base bodydecreases, or the lattice constant for those areasincreases, in the direction from an outer edge toward the center of a current passage regionwhich is a region where the electric current passes through the two-dimensional photonic crystal. With this configuration, a stable laser oscillation can be obtained even when a temperature distribution which is lower at the outer edge and higher at the center of the current passage region is formed within the two-dimensional photonic crystal.