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:
Mar. 07, 2023
Filed:
Apr. 02, 2021
Riken, Wako, JP;
Li Wang, Wako, JP;
Hideki Hirayama, Wako, JP;
RIKEN, Saitama, JP;
Abstract
In order to provide a QCL element operating in the near-infrared wavelength range, the present disclosure provides a quantum cascade laser elementhaving a semiconductor superlattice structure (QCL structure) sandwiched between a pair of conductive sectionsand. The semiconductor superlattice structure serves as an active region that emits electromagnetic waves. The active region has a plurality of unit structuresU that are stacked on top of each other. Each unit structure includes four well layersW-Wof a composition of AlGaN, separated from each other by barrier layersB-Bof a composition of AlGaN with 0≤x<y≤1. Both of the conductive sections in the pair of conductive sections have a refractive index lower than that of the active region in which doped TCO inserted as a key role.