公开(公告)号：US20230304926A1

公开(公告)日：2023-09-28

申请号：US18120533

申请日：2023-03-13

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Hisanari TAKAHASHI ,  Koyo WATANABE ,  Hiroshi SATOZONO ,  Kyohei SHIGEMATSU ,  Takashi INOUE

IPC: G01N21/39 ,  G01N21/27 ,  G01N21/31

CPC classification number: G01N21/39 ,  G01N21/27 ,  G01N21/314 ,  G01N2021/1789

Abstract: A time response measurement apparatus includes a pulse formation unit, an attenuation unit, a waveform measurement unit, and an analysis unit. The pulse formation unit generates first pulsed light including a wavelength of pump light, second pulsed light including a wavelength of probe light, and third pulsed light including the wavelength of the pump light and the wavelength of the probe light, on a common optical axis. The attenuation unit transmits the first pulsed light, the second pulsed light, and the third pulsed light output from a sample arranged on the optical axis after being incident on the sample. An attenuation rate for the pump light is larger than an attenuation rate for the probe light. The analysis unit obtains a time response of the sample based on temporal waveforms of the first pulsed light, the second pulsed light, and the third pulsed light having passed through the attenuation unit.

公开(公告)号：US20220236416A1

公开(公告)日：2022-07-28

申请号：US17569592

申请日：2022-01-06

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Hisanari TAKAHASHI ,  Koyo WATANABE ,  Hiroshi SATOZONO ,  Takashi INOUE

IPC: G01S17/26 ,  G01S7/484 ,  G01S7/486

Abstract: An optical measurement device includes a light pulse source, a light separator unit, a wave synthesizer unit, an optical detection unit, and a measurement unit. The light pulse source outputs a plurality of light pulses having different temporal waveforms and different center wavelengths. The light separator unit spatially separates the light pulses and causes the light pulses to be incident on a measurement object. The wave synthesizer unit synthesizes the light pulses reflected by the measurement object or transmitted through the measurement object and emits the synthesized light pulses onto one optical path. The optical detection unit receives the light pulses emitted from the wave synthesizer unit and outputs a temporal waveform signal of the light pulses. The measurement unit measures timings when the light pulses each are received by the optical detection unit or a difference between the timings on a basis of the temporal waveform signal.

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).