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. 26, 2026
Filed:
Dec. 02, 2021
Horiba, Ltd., Kyoto, JP;
HORIBA, LTD., , JP;
Abstract
The present invention enables single mode light to be stably output while also enabling the intensity thereof to be increased, and is a distributed feedback type of semiconductor laser element in which a diffraction grating is formed on a waveguide. The waveguide includes a diffraction grating portion where the diffraction grating is formed, and a flat portion having a region where the diffraction grating is not formed and whose width is broader than the diffraction grating portion. The flat portion has a connecting portion having a region whose width changes continuously approaching a connection location with the diffraction grating portion, and a high-reflection film is provided on an end surface of the flat portion that is on an opposite side from the connecting portion, while an anti-reflection film is provided on an end surface of the diffraction grating portion that is on an opposite side from the connecting portion.