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:
Jul. 10, 2012
Filed:
Jul. 22, 2009
Osamu Maeda, Kanagawa, JP;
Yuji Masui, Kanagawa, JP;
Masaki Shiozaki, Kanagawa, JP;
Takahiro Arakida, Kanagawa, JP;
Takayuki Kawasumi, Kanagawa, JP;
Osamu Maeda, Kanagawa, JP;
Yuji Masui, Kanagawa, JP;
Masaki Shiozaki, Kanagawa, JP;
Takahiro Arakida, Kanagawa, JP;
Takayuki Kawasumi, Kanagawa, JP;
Sony Corporation, Tokyo, JP;
Abstract
The present invention provides a Vertical Cavity Surface Emitting Laser including: a first multilayer film reflector; an active layer having a light emission region; a second multilayer film reflector; and a reflectance adjustment layer in this order on a substrate side. The first multilayer film reflector and the second multilayer film reflector have a laminated structure in which reflectance of oscillation wavelength λis almost constant without depending on temperature change. The active layer is made of a material with which a maximum gain is obtained at temperature higher than ambient temperature. The reflectance adjustment layer has a laminated structure in which difference ΔR(=R−R) between reflectance Rof a region opposed to a central region of the light emission region and reflectance Rof a region opposed to an outer edge region of the light emission region is increased associated with temperature increase from ambient temperature to high temperature.