公开(公告)号：US20240201046A1

公开(公告)日：2024-06-20

申请号：US18286272

申请日：2022-03-14

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Koyo WATANABE ,  Hisanari TAKAHASHI ,  Takashi INOUE

IPC: G01M11/00

CPC classification number: G01M11/338

Abstract: A dispersion measuring device includes a pulsed laser light source, a pulse forming unit, a correlator, and an arithmetic operation unit. The pulse forming unit forms an optical pulse train from an optical pulse output from the pulsed laser light source. The correlator detects a temporal waveform of correlated light formed from the optical pulse train. The arithmetic operation unit estimates a wavelength dispersion amount of an optical component disposed between the pulsed laser light source and the correlator, based on the temporal waveform of the correlated light. A dispersion medium gives a group delay dispersion to the optical pulse train to increase the peak intensity of the correlated light to be equal to or greater than a threshold value of the correlator. The pulse forming unit gives a group delay dispersion having a sign opposite to the group delay dispersion given to the optical pulse train to the optical pulse.

公开(公告)号：US20240110833A1

公开(公告)日：2024-04-04

申请号：US18530698

申请日：2023-12-06

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.

公开(公告)号：US20230304923A1

公开(公告)日：2023-09-28

申请号：US18120551

申请日：2023-03-13

Applicant: HAMAMATSU PHOTONICS K.K.

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

IPC: G01N21/31 ,  G02F1/31

CPC classification number: G01N21/31 ,  G02F1/31 ,  G02F2203/055

Abstract: An optical property measurement apparatus includes a pulse formation unit, a waveform measurement unit, and an optical system. The pulse formation unit is capable of changing a temporal waveform of pulsed light in accordance with a type of optical property to be measured. The waveform measurement unit measures a temporal waveform of the pulsed light output from a measurement object after being incident on the measurement object. The optical system has an attenuation unit with an attenuation rate with respect to one wavelength component constituting the pulsed light larger than an attenuation rate with respect to another wavelength component constituting the pulsed light. The optical system is capable of switching between a first state in which the attenuation unit is arranged on an optical path of the pulsed light output from the measurement object and a second state in which the attenuation unit is not arranged on the optical path.

公开(公告)号：US20240210275A1

公开(公告)日：2024-06-27

申请号：US18286857

申请日：2022-03-14

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Koyo WATANABE ,  Hisanari TAKAHASHI ,  Takashi INOUE

IPC: G01M11/02

CPC classification number: G01M11/0285

Abstract: A dispersion measurement device includes a pulse forming unit, an optical detection unit, and an arithmetic operation unit. The pulse forming unit includes an SLM that presents a phase pattern, and forms an optical pulse train from the first optical pulse, the optical pulse train including a plurality of second optical pulses having a time difference from each other and having center wavelengths different from each other. The optical detection unit detects a temporal waveform of the optical pulse train. An optical component is arranged on an optical path between the pulse forming unit and the optical detection unit. The arithmetic operation unit estimates a wavelength dispersion amount of the optical component based on a feature amount of the temporal waveform. The phase pattern gives a group delay dispersion having a sign opposite to the group delay dispersion of the optical component to the first optical pulse.

公开(公告)号：US20220107221A1

公开(公告)日：2022-04-07

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 ,  G01J3/28 ,  G01J3/02

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.

公开(公告)号：US20230361536A1

公开(公告)日：2023-11-09

申请号：US18115844

申请日：2023-03-01

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Hisanari TAKAHASHI ,  Kazuue FUJITA ,  Shohei HAYASHI

IPC: H01S5/04 ,  H01S5/34 ,  H01S5/02 ,  H01S5/02253

CPC classification number: H01S5/3402 ,  H01S5/021 ,  H01S5/02253 ,  H01S5/041 ,  H01S2302/02

Abstract: The laser module includes a QCL element and a light source. The QCL element includes a substrate, a lower clad layer provided on the substrate, an active layer that is provided on an opposite side of the lower clad layer from the substrate and generates a first terahertz wave, an upper clad layer provided on an opposite side of the active layer from the lower clad layer, and a first electrode provided on an opposite side of the upper clad layer from the active layer. The second terahertz wave from the light source enters the active layer through the substrate, is reflected by the first electrode, and is amplified or wavelength-converted. The third terahertz wave amplified or wavelength-converted in the active layer is emitted to the outside through the substrate.

公开(公告)号：US20220019094A1

公开(公告)日：2022-01-20

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：US20250079805A1

公开(公告)日：2025-03-06

申请号：US18822534

申请日：2024-09-03

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Hisanari TAKAHASHI ,  Kazuue FUJITA ,  Tatsuo DOUGAKIUCHI

IPC: H01S5/34 ,  G01N21/3581

Abstract: A terahertz wave detection device includes a QCL element, an optical component disposed such that a laser beam emitted from the QCL element passes, and a photodetector that detects the laser beam having passed through the optical component. The QCL element has a semiconductor layer including an active layer in which unit stacked bodies including a light emitting layer and an injection layer are stacked in multiple stages. The unit stacked body is configured to be able to oscillate a first laser beam having a first wavelength and a second laser beam having a second wavelength. The QCL element is configured to change oscillation degrees of the first and second laser beams in accordance with the incidence of the terahertz wave on the QCL element. The optical component is configured to cause either one of the first laser beam and the second laser beam to be incident on the photodetector.

公开(公告)号：US20240192082A1

公开(公告)日：2024-06-13

申请号：US18286250

申请日：2022-03-14

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Koyo WATANABE ,  Hisanari TAKAHASHI ,  Takashi INOUE

IPC: G01M11/02

CPC classification number: G01M11/0207

Abstract: A dispersion measuring device includes a pulse forming unit, a light detection unit, a control unit, and an arithmetic operation unit. The control unit selectively outputs a first phase pattern and a second phase pattern. The pulse forming unit forms an optical pulse train from initial pulsed light, the optical pulse train including a plurality of optical pulses having a time difference from each other and having different center wavelengths from each other. The light detection unit detects a temporal waveform of the optical pulse train. The arithmetic operation unit estimates a wavelength dispersion amount of a measurement object based on a feature amount of the temporal waveform of the optical pulse train. When the first phase pattern is output, a pulse having a long center wavelength is generated first. When the second phase pattern is output, a pulse having a short center wavelength is generated first.

公开(公告)号：US20230333007A1

公开(公告)日：2023-10-19

申请号：US18026173

申请日：2021-07-05

Applicant: HAMAMATSU PHOTONICS K.K.

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

IPC: G01N21/31

CPC classification number: G01N21/31 ,  G01N2201/0634

Abstract: A dispersion measurement apparatus includes a pulse forming unit, an imaging 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 light pulse output from a pulsed laser light source. The imaging unit includes an image sensor capable of performing imaging at an imaging interval shorter than a minimum peak interval of the light pulse train, and images a light pulse train passed through a measurement object to generate imaging data. The operation unit receives the imaging data, detects a temporal waveform of the light pulse train for each pixel of the image sensor, and estimates a wavelength dispersion amount of the measurement object for each pixel of the image sensor based on a feature value of the temporal waveform.