公开(公告)号：US10809189B2

公开(公告)日：2020-10-20

申请号：US16285274

申请日：2019-02-26

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Kazuki Horita ,  Yoichi Kawada ,  Atsushi Nakanishi ,  Kazuue Fujita ,  Hironori Takahashi ,  Hiroshi Satozono

IPC: G01N21/35 ,  G01N21/3586 ,  G01J3/42 ,  G01N21/552 ,  G01N21/25 ,  G01N21/31 ,  G01N21/3581

Abstract: An optical measurement device includes a light source configured to output a terahertz wave and coaxial light having a wavelength different from the wavelength of the terahertz wave, coaxially with the terahertz wave; an intensity modulation unit configured to perform intensity modulation of at least the terahertz wave of the terahertz wave and the coaxial light in a predetermined modulation frequency; and a light detection unit configured to synchronously detects each of the terahertz wave and the coaxial light which have acted on a measurement subject via the intensity modulation unit based on the modulation frequency.

公开(公告)号：US10591669B2

公开(公告)日：2020-03-17

申请号：US14906924

申请日：2014-05-20

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Yoichi Kawada ,  Takashi Yasuda ,  Atsushi Nakanishi

IPC: G02B6/10 ,  H01Q15/04 ,  G02B5/30

Abstract: A wave plate comprising: a prism member having an entrance surface for receiving a terahertz wave T, and an exit surface for emitting the terahertz wave T received by the entrance surface; wherein the prism member is constituted by a plurality of waveguide regions having: a partial entrance surface for receiving a part of the terahertz wave T, a plurality of total reflection surfaces for totally reflecting the terahertz wave T from the partial entrance surface, and a partial exit surface for emitting the terahertz wave T totally reflected from the total reflection surfaces; and each of the partial entrance surfaces combine to constitute the entrance surface of the prism member, and each of the partial exit surfaces combine to constitute the exit surface of the prism member, by stacking waveguide regions.

公开(公告)号：US10591509B2

公开(公告)日：2020-03-17

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 ,  G01Q60/16

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：US09128041B2

公开(公告)日：2015-09-08

申请号：US13742616

申请日：2013-01-16

Applicant: Hamamatsu Photonics K.K.

Inventor： Gen Takebe ,  Yoichi Kawada ,  Kouichiro Akiyama

IPC: G01J5/02 ,  G01N21/3577 ,  G01N21/3563 ,  G01N21/3586

Abstract: The drug evaluation device obtains, by an attenuated reflection method using a terahertz wave, an evaluation absorption spectrum for a frequency with respect to a liquid to be evaluated. When crystalline particles are suspended in a liquid, an absorption peak having a peak area corresponding to the amount of suspension appears in its absorption spectrum. Therefore, whether or not and by what ratio crystalline particles are suspended in the liquid can be determined according to whether or not the absorption peak exists and the peak area. When amorphous particles are suspended in the liquid, the baseline of its absorption spectrum lowers according to the ratio of amorphous particles suspended in the liquid. Therefore, whether or not and by what ratio amorphous particles are suspended in the liquid can be determined according to the lowering amount of the baseline.

公开(公告)号：US12176681B2

公开(公告)日：2024-12-24

申请号：US17439884

申请日：2020-01-14

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Tatsuo Dougakiuchi ,  Yoichi Kawada

IPC: H01S5/14 ,  H01S5/02325 ,  H01S5/34

Abstract: An optical kit includes a base including a main surface; and a holding unit provided on the main surface to hold an optical system. The holding unit includes a lens holding unit that holds a lens, a reflector holding unit that holds a corner reflector, a first aperture member holding unit that holds a first aperture member, a second aperture member holding unit that holds a second aperture member, and a third aperture member holding unit that holds a third aperture member. The reflector holding unit includes a first mechanism that holds an entirety of the corner reflector so as to be rotatable along the main surface, and a second mechanism configured to adjust an optical axis of a diffracted light in each of a reflective diffraction grating and a mirror.

公开(公告)号：US10908355B2

公开(公告)日：2021-02-02

申请号：US16739214

申请日：2020-01-10

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Yoichi Kawada ,  Takashi Yasuda ,  Atsushi Nakanishi

IPC: G02B6/10 ,  H01Q15/04 ,  G02B5/30

Abstract: A wave plate comprising: a prism member having an entrance surface for receiving a terahertz wave T, and an exit surface for emitting the terahertz wave T received by the entrance surface; wherein the prism member is constituted by a plurality of waveguide regions having: a partial entrance surface for receiving a part of the terahertz wave T, a plurality of total reflection surfaces for totally reflecting the terahertz wave T from the partial entrance surface, and a partial exit surface for emitting the terahertz wave T totally reflected from the total reflection surfaces; and each of the partial entrance surfaces combine to constitute the entrance surface of the prism member, and each of the partial exit surfaces combine to constitute the exit surface of the prism member, by stacking waveguide regions.

公开(公告)号：US10895504B2

公开(公告)日：2021-01-19

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 ,  G01N21/552

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.

公开(公告)号：US10082720B2

公开(公告)日：2018-09-25

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 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).