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:
Oct. 27, 2026
Filed:
Mar. 02, 2022
Hamamatsu Photonics K.k., Hamamatsu, JP;
Kazuyoshi Hirose, Hamamatsu, JP;
Masahiro Hitaka, Hamamatsu, JP;
Hiroki Kamei, Hamamatsu, JP;
Takahiro Sugiyama, Hamamatsu, JP;
HAMAMATSU PHOTONICS K.K., Hamamatsu, JP;
Abstract
A surface-emitting laser device includes a first electrode, a lower cladding layer, an active layer, an upper cladding layer, a relaxation layer, a contacting layer having a bandgap different from that of the upper cladding layer, a second electrode, and a photonic crystal layer provided between the lower cladding layer and the active layer or between the active layer and the upper cladding layer, including a basic region and a plurality of different refractive index regions that differ in refractive index from the basic region and are distributed two-dimensionally in a plane perpendicular to a thickness direction to form a resonance mode of light in the plane. The relaxation layer has a bandgap that is between a bandgap of the upper cladding layer and a bandgap of the contacting layer.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile