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:
Nov. 01, 2016
Filed:
May. 19, 2014
Hamamatsu Photonics K.k., Hamamatsu-shi, Shizuoka, JP;
HAMAMATSU PHOTONICS K.K., Hamamatsu-shi, Shizuoka, JP;
Abstract
A quantum cascade laser is configured with a semiconductor substrate and first and second active layers provided in series on the substrate. A unit laminate structure of the first active layer has a subband level structure having an emission upper level and an emission lower level, and is configured so as to be able to generate light of a first frequency ω, a unit laminate structure of the second active layer has a subband level structure having a first emission upper level, a second emission upper level, and a plurality of emission lower levels, and is configured so as to be able to generate light of a second frequency ω, and light of a difference frequency ω is generated by difference frequency generation from the light of the first frequency ωand the light of the second frequency ω.