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:
Jun. 28, 2016
Filed:
Jul. 02, 2015
Canon Kabushiki Kaisha, Tokyo, JP;
Yasuhiro Nagatomo, Kawasaki, JP;
CANON KABUSHIKI KAISHA, Tokyo, JP;
Abstract
In order to provide a wavelength tunable surface emitting laser capable of improving a wavelength tuning efficiency, provided is a surface emitting laser, including: a first reflector; a semiconductor cavity including an active layer; and a second reflector, the first reflector, the semiconductor cavity, and the second reflector being formed in the stated order, a gap portion being formed between the first reflector and a semiconductor layer, a cavity length being tunable, in which the surface emitting laser has a high reflectivity structure formed between the gap portion and the semiconductor cavity, and an expression of '(λ/2)×m+λ/8<L<(λ/2)×m+3λ/8' is satisfied, where L is an optical thickness of the semiconductor cavity, m is an integer of 1 or larger, and λ is a center wavelength of laser oscillation.