公开(公告)号：US11821793B2

公开(公告)日：2023-11-21

申请号：US17600667

申请日：2020-03-27

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Koyo Watanabe ,  Kyohei Shigematsu ,  Takashi Inoue

IPC: G01J3/453 ,  G01J11/00 ,  G01M11/00 ,  H01S3/00

CPC classification number: G01J3/453 ,  G01J11/00 ,  G01M11/3163 ,  H01S3/0057 ,  H01S3/0092

Abstract: A dispersion measurement apparatus includes a pulse forming unit, a correlation optical system, a photodetection unit, and an operation unit. The pulse forming unit forms a light pulse train including a plurality of light pulses having time differences and center wavelengths different from each other from a measurement target light pulse output from a pulsed laser light source. The correlation optical system receives the light pulse train output from the pulse forming unit and outputs correlation light including a cross-correlation or an autocorrelation of the light pulse train. The photodetection unit detects a temporal waveform of the correlation light output from the correlation optical system. The operation unit estimates a wavelength dispersion amount of the pulsed laser light source based on a feature value of the temporal waveform of the correlation light.

公开(公告)号：US12259601B2

公开(公告)日：2025-03-25

申请号：US17370468

申请日：2021-07-08

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Koyo Watanabe ,  Naoya Matsumoto ,  Hisanari Takahashi ,  Kyohei Shigematsu ,  Takashi Inoue

IPC: G02F1/01

Abstract: Provided is a light shaping device including: an intensity modulation unit that modulates a spectrum intensity of an optical pulse that is input light, and outputs the optical pulse of which a temporal width is narrowed as output light. The intensity modulation unit modulates the spectrum intensity of the optical pulse with a mask expressed by a starting end wavelength from a central wavelength of the input light and a wavelength width.

公开(公告)号：US11913836B2

公开(公告)日：2024-02-27

申请号：US17488493

申请日：2021-09-29

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Koyo Watanabe ,  Hisanari Takahashi ,  Kyohei Shigematsu ,  Takashi Inoue

IPC: G01J3/44 ,  G01J3/02 ,  G01J3/28

CPC classification number: G01J3/4412 ,  G01J3/0208 ,  G01J3/0229 ,  G01J3/2823

Abstract: A dispersion measurement apparatus includes a pulse forming unit, a correlation optical system, a beam splitter, an operation unit, an imaging unit, a spatial filter unit, and a photodetector. The pulse forming unit forms a light pulse train including light pulses having time differences and different center wavelengths. The beam splitter branches the light pulse train passed through a measurement object. The imaging unit disperses one light pulse train and images each light pulse. The spatial filter unit extracts light of a partial region of the other light pulse train. The correlation optical system outputs correlation light including a cross-correlation or an autocorrelation of the extracted light. The photodetector detects a temporal waveform of the correlation light. The operation unit estimates a wavelength dispersion amount in the measurement object based on a feature value of the temporal waveform.