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. 02, 2021
Filed:
Feb. 21, 2020
Tohoku Techno Arch Co., Ltd., Sendai, JP;
Hamamatsu Photonics K.k., Hamamatsu, JP;
Yuji Matsuura, Sendai, JP;
Naoto Shibata, Sendai, JP;
TOHOKU TECHNO ARCH CO., LTD., Sendai, JP;
HAMAMATSU PHOTONICS K.K., Hamamatsu, JP;
Abstract
A spectrum measurement apparatus includes a signal generation unit, a detector, an AD converter, and an operation unit. An external cavity laser light source includes a quantum cascade laser and a diffraction grating. The signal generation unit outputs a wavelength sweep signal repeatedly giving an instruction for sweep of a resonant wavelength selected by the diffraction grating and a pumping instruction signal repeatedly giving an instruction for on/off of pumping of the quantum cascade laser in each period of wavelength sweep based on the instruction of the wavelength sweep signal. The operation unit inputs a digital value output from the AD converter, obtains an oscillation spectrum in each period of the wavelength sweep, and integrates the oscillation spectra obtained with changing the phase of the pumping instruction signal for each period of the wavelength sweep.