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:
Dec. 27, 2022
Filed:
Mar. 23, 2021
Applicants:
Denso Corporation, Kariya, JP;
Tohoku University, Sendai, JP;
Waseda University, Tokyo, JP;
Inventors:
Masashige Sato, Kariya, JP;
Taku Suzuki, Kariya, JP;
Hiroshi Yasaka, Sendai, JP;
Nobuhide Yokota, Sendai, JP;
Tomohiro Kita, Shinjuku-ku, JP;
Assignees:
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01S 5/0687 (2006.01); H01S 5/042 (2006.01); H01S 5/00 (2006.01); H01S 5/062 (2006.01);
U.S. Cl.
CPC ...
H01S 5/0687 (2013.01); H01S 5/0014 (2013.01); H01S 5/0427 (2013.01); H01S 5/06246 (2013.01);
Abstract
A laser apparatus includes: a light source configured to generate laser light; and an optical negative feedback unit configured to narrow a spectral line of the laser light using optical negative feedback. A modulation signal is input to the light source to modulate a frequency of the laser light. A modulation amount in the frequency of the laser light is detected. A modulation sensitivity is calculated from (i) the modulation amount and (ii) an intensity of the modulation signal.