公开(公告)号：US20180067376A1

公开(公告)日：2018-03-08

申请号：US15696432

申请日：2017-09-06

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Hisanari TAKAHASHI ,  Yoichi KAWADA ,  Takashi INOUE ,  Koyo WATANABE ,  Koji TAKAHASHI ,  Hironori TAKAHASHI

IPC: G02F1/35 ,  G02F1/355

CPC classification number: G02F1/353 ,  G02F1/3551 ,  G02F2001/3548 ,  G02F2201/34 ,  G02F2202/20 ,  G02F2203/13

Abstract: A wavelength conversion element includes a crystal having a periodically poled structure in which polarization is inverted with an inversion period Λ along a z-axis which is an input axis of a light pulse. The wavelength conversion element is configured to generate an output light pulse converted to have an output frequency f(x) corresponding to the inversion period Λ(x) at each position x by change of the inversion period Λ according to the position x, and when a target frequency linearly changing with the position x is set to fT(x)=b+ax, a frequency width of the output frequency is set to δf(x), and the output frequency is set to f(x)=fT(x)+α(x), the output frequency is set to coincide with the target frequency within a range satisfying a condition |α(x)|≦δf(x).

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.

公开(公告)号：US20190025124A1

公开(公告)日：2019-01-24

申请号：US16039163

申请日：2018-07-18

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Takashi YASUDA ,  Yoichi KAWADA ,  Kazuki HORITA ,  Hironori TAKAHASHI ,  Takayoshi KUGA ,  Atsushi NAKANISHI ,  Kazutaka TOMARI

IPC: G01J3/42 ,  G01J3/02 ,  G01N21/3586

Abstract: A measurement auxiliary member is placed on an arrangement surface of a prism. A measurement object is placed on an upper surface of the measurement auxiliary member. The measurement auxiliary member totally reflects the terahertz wave input from a lower surface by the upper surface and outputs the totally-reflected terahertz wave from the lower surface. A main pulse of a terahertz wave totally reflected by the upper surface of the measurement auxiliary member without multiply-reflected inside any optical element on an optical path of the terahertz wave, and a noise pulse of a terahertz wave multiply-reflected inside any optical element on the optical path and reflected on an interface between the prism and the measurement auxiliary member, are temporally separated from each other when detecting a correlation by a terahertz wave detection element.