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. 22, 2019
Filed:
Aug. 22, 2018
Hamamatsu Photonics K.k., Hamamatsu-shi, Shizuoka, JP;
Yoichi Kawada, Hamamatsu, JP;
Hironori Takahashi, Hamamatsu, JP;
Jun Takeda, Yokohama, JP;
Ikufumi Katayama, Yokohama, JP;
Yusuke Arashida, Yokohama, JP;
Katsumasa Yoshioka, Yokohama, JP;
HAMAMATSU PHOTONICS K.K., Hamamatsu-shi, Shizuoka, JP;
Abstract
A tunnel current control apparatus includes a light source, a branching unit, a chopper, an optical path difference adjustment unit, a polarizer, a terahertz wave generation element, a CEP adjustment unit, a terahertz wave detection element, a quarter-wave plate, a polarization separation element, photodetectors, a differential amplifier, a lock-in amplifier, a current measurement unit, a processing unit, mirrors, and off-axis parabolic mirrors. The CEP adjustment unit can arbitrarily adjust a CEP of a terahertz wave pulse. The processing unit obtains a conversion filter used for conversion from an electric field waveform of a far field of the terahertz wave pulse to an electric field waveform of a near field based on a tunnel current measured by the current measurement unit and a correlation detected by the terahertz wave detection element.