公开(公告)号：US20190064210A1

公开(公告)日：2019-02-28

申请号：US16108447

申请日：2018-08-22

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Yoichi KAWADA ,  Hironori TAKAHASHI ,  Jun TAKEDA ,  Ikufumi KATAYAMA ,  Yusuke ARASHIDA ,  Katsumasa YOSHIOKA

IPC: G01Q60/16 ,  G01Q10/04

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.

公开(公告)号：US20190064209A1

公开(公告)日：2019-02-28

申请号：US16106134

申请日：2018-08-21

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Yoichi KAWADA ,  Hironori TAKAHASHI ,  Jun TAKEDA ,  Ikufumi KATAYAMA ,  Yusuke ARASHIDA ,  Katsumasa YOSHIOKA

IPC: G01Q30/02 ,  G01Q60/30

CPC classification number: G01Q30/02 ,  G01Q60/16 ,  G01Q60/30

Abstract: A tunnel current control apparatus includes a terahertz wave generation element configured to generate and output a terahertz wave pulse, a CEP adjustment unit configured to adjust a CEP of the terahertz wave pulse, and an off-axis parabolic mirror serving as a focusing element configured to focus the terahertz wave pulse in a gap between a first conductive object and a second conductive object. The CEP adjustment unit can arbitrarily adjust the CEP of the terahertz wave pulse.