公开(公告)号：US20180294615A1

公开(公告)日：2018-10-11

申请号：US15573935

申请日：2016-05-11

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Koyo WATANABE ,  Takashi INOUE ,  Koji TAKAHASHI

IPC: H01S3/00 ,  G02F1/01 ,  G06F17/14 ,  G05B15/02

CPC classification number: H01S3/0085 ,  G02F1/01 ,  G02F1/0121 ,  G02F1/13 ,  G02F1/133 ,  G02F2203/12 ,  G05B15/02 ,  G06F17/14

Abstract: An iterative Fourier transform unit in a modulation pattern calculation apparatus performs a Fourier transform on a waveform function including an intensity spectrum function and a phase spectrum function, performs a replacement of a temporal intensity waveform function based on a desired waveform after the Fourier transform, and then performs an inverse Fourier transform. The iterative Fourier transform unit performs the replacement using a result of multiplying a function representing the desired waveform by a coefficient, and the coefficient has a value in which a difference between the function after the multiplication and the temporal intensity waveform function after the Fourier transform is smaller than a difference before the multiplication of the coefficient.

公开(公告)号：US20250068002A1

公开(公告)日：2025-02-27

申请号：US18721444

申请日：2023-01-11

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Ryu NIIGAKI ,  Koji TAKAHASHI ,  Kyohei SHIGEMATSU

IPC: G02F1/01

Abstract: In a multi-pulse light source, a dispersion compensation unit includes a spectroscopic element configured to spectrally separate a plurality of wavelength components, a separation optical element that guides a first optical pulse group including one or more wavelength components among a plurality of wavelength components, and a second optical pulse group including one or more wavelength components different from the one or more wavelength components included in the first optical pulse group among the plurality of wavelength components to optical paths different from each other, a first spatial light modulator on which the first optical pulse group is incident and which compensates dispersion for each wavelength component with respect to the first optical pulse group, and a second spatial light modulator on which the second optical pulse group is incident and which compensates dispersion for each wavelength component with respect to the second optical pulse group.

公开(公告)号：US20180348549A1

公开(公告)日：2018-12-06

申请号：US15573900

申请日：2016-05-11

Applicant: HAMAMATSU PHOTONICS K.K.

Inventor： Koyo WATANABE ,  Takashi INOUE ,  Koji TAKAHASHI

IPC: G02F1/01

CPC classification number: G02F1/01 ,  G02F1/13 ,  G02F1/133 ,  G02F2203/12 ,  G02F2203/18 ,  G02F2203/26 ,  G02F2203/50

Abstract: A modulation pattern calculation apparatus includes an iterative Fourier transform unit, a filtering process unit, and a modulation pattern calculation unit. The iterative Fourier transform unit performs a Fourier transform on a waveform function including an intensity spectrum function and a phase spectrum function, performs a replacement of a temporal intensity waveform function based on a desired waveform after the Fourier transform and then performs an inverse Fourier transform, and performs a replacement to constrain the phase spectrum function after the inverse Fourier transform. The filtering process unit performs a filtering process of cutting a part exceeding a cutoff intensity for each wavelength, on the intensity spectrum function in a frequency domain.

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).