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. 05, 2026
Filed:
Apr. 28, 2021
Applicant:
Kabushiki Kaisha Toshiba, Tokyo, JP;
Inventors:
Rei Hashimoto, Edogawa, JP;
Tsutomu Kakuno, Fujisawa, JP;
Kei Kaneko, Yokohama, JP;
Shinji Saito, Yokohama, JP;
Assignee:
KABUSHIKI KAISHA TOSHIBA, Tokyo, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01S 5/34 (2006.01); H01S 5/11 (2021.01); H01S 5/12 (2021.01); H01S 5/18 (2021.01);
U.S. Cl.
CPC ...
H01S 5/3401 (2013.01); H01S 5/11 (2021.01); H01S 5/1237 (2013.01); H01S 5/18 (2013.01);
Abstract
According to one embodiment, a surface-emitting quantum cascade laser includes a substrate; a mesa portion of a semiconductor stacked body located on the substrate, and a reflective film located at a sidewall of the mesa portion. The mesa portion includes a light-emitting layer emitting light due to an intersubband transition of a carrier, and a photonic crystal layer including a two-dimensional diffraction grating.