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. 17, 2026
Filed:
Sep. 28, 2021
Hamamatsu Photonics K.k., Hamamatsu, JP;
HAMAMATSU PHOTONICS K.K., Hamamatsu, JP;
Abstract
A semiconductor laser element of the present disclosure reducing one-dimensional local oscillation includes a substrate, an active layer, and a phase modulation layer. The phase modulation layer includes a base layer and modified refractive index regions two-dimensionally placed on a reference surface. In a virtual square lattice on the reference surface, the gravity center of each modified refractive index region is placed away from the corresponding lattice point, and an angle of a vector connecting the corresponding lattice point to the gravity center is set individually. A lattice spacing and a light emission wavelength of the active layer satisfy a Γ-point oscillation condition. The gravity center of each modified refractive index region is placed such that the absolute value of the Fourier coefficient of an annular or a circular shape obtained by rotating each modified refractive index region with the corresponding lattice point is 0.01 or less.