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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
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.
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公开(公告)号：US10989935B2
公开(公告)日：2021-04-27
申请号：US15573900
申请日：2016-05-11
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Koyo Watanabe , Takashi Inoue , Koji Takahashi
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.
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13.发明授权公开(公告)号：US10942418B2
公开(公告)日：2021-03-09
申请号：US16327891
申请日：2017-07-28
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Koyo Watanabe , Koji Takahashi , Takashi Inoue
IPC: G02F2/00
Abstract: A Fourier transform is performed on a first waveform function in a frequency domain, and a second waveform function in a time domain including a temporal intensity waveform function and a temporal phase waveform function is generated. A replacement of the temporal intensity waveform function based on a desired waveform is performed for the second waveform function. The second waveform function is modified so as to bring a spectrogram of the second waveform function close to a target spectrogram generated in advance in accordance with a desired wavelength band. An inverse Fourier transform is performed on the modified second waveform function, and a third waveform function in the frequency domain is generated. Data is generated on the basis of an intensity spectrum function or a phase spectrum function of the third waveform function.
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公开(公告)号：US10578601B2
公开(公告)日：2020-03-03
申请号：US16046530
申请日：2018-07-26
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Naoya Matsumoto , Koyo Watanabe , Hirotoshi Terada
IPC: G01N21/41 , G01N33/483 , G01B11/24 , G01N21/64 , G02B21/16 , G02B21/00 , G02B5/32 , G02B27/00 , G03H1/00 , G03H1/08 , G01N21/63 , G03H1/22
Abstract: A photostimulation apparatus includes an objective lens arranged to face a biological object, a light source configured to output light to be radiated toward the biological object via the objective lens, a shape acquisition unit configured to acquire information about a shape with a refractive index difference in the biological object, a hologram generation unit configured to generate aberration correction hologram data for correcting aberrations due to the shape with the refractive index difference on the basis of the information acquired by the shape acquisition unit, and a spatial light modulator on which a hologram based on the aberration correction hologram data is presented and which modulates the light output from the light source.
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15.发明授权公开(公告)号：US12204182B2
公开(公告)日：2025-01-21
申请号：US18229909
申请日：2023-08-03
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Koyo Watanabe , Takashi Inoue
Abstract: An iterative Fourier transform unit of 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. The coefficient has a value with which a difference between the function after the multiplication of the coefficient and the temporal intensity waveform function after the Fourier transform is smaller than a difference before the multiplication, and a ratio of the difference is smaller when an intensity is higher at each time of the function before the multiplication.
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Patent Agency Ranking
16.发明授权公开(公告)号：US11762225B2
公开(公告)日：2023-09-19
申请号：US16732590
申请日：2020-01-02
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Koyo Watanabe , Takashi Inoue
CPC classification number: G02F1/0121 , G06F17/148 , G02F2201/305
Abstract: An iterative Fourier transform unit of 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. The coefficient has a value with which a difference between the function after the multiplication of the coefficient and the temporal intensity waveform function after the Fourier transform is smaller than a difference before the multiplication, and a ratio of the difference is smaller when an intensity is higher at each time of the function before the multiplication.
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公开(公告)号：US11079618B2
公开(公告)日：2021-08-03
申请号：US16089400
申请日：2017-03-15
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Koyo Watanabe , Koji Takahashi , Takashi Inoue , Haruyasu Ito
Abstract: An imaging system includes a light source for outputting initial pulsed light, a polarization control unit for rotating a polarization plane of the initial pulsed light, an optical pulse shaping unit for inputting the initial pulsed light with the rotated polarization plane, and outputting first pulsed light Lp1 having a first polarization direction and second pulsed light Lp2 having a second polarization direction different from the first polarization direction with a time, an irradiation optical system for irradiating an imaging object with the pulsed light Lp1 and the pulsed light Lp2, a light separation element for separating the pulsed light Lp1 and the pulsed light Lp2 reflected by or transmitted through the imaging object on the basis of the polarization directions, an imaging unit for imaging the pulsed light Lp1, and an imaging unit for imaging the pulsed light Lp2.
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18.发明授权公开(公告)号：US11022938B2
公开(公告)日：2021-06-01
申请号：US16270968
申请日：2019-02-08
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Koyo Watanabe , Takashi Inoue
Abstract: A data generating device sets an initial candidate solution of an intensity spectrum function, a phase spectrum function, and an initial temperature and a cooling rate, generates a neighborhood solution, transforms a first waveform function of a frequency domain including the neighborhood solution and the phase spectrum function into a second waveform function of a time domain including a time-intensity waveform function and a time-phase waveform function and calculates an evaluation value representing a degree of difference between the time-intensity waveform function and the desired time-intensity waveform, sets the neighborhood solution as an n-th candidate solution for a certain probability, and lowers the temperature on the basis of the cooling rate. A decrease in the temperature acts in a direction in which the probability P is lowered when the evaluation value of the neighborhood solution is worse than the evaluation value of the candidate solution.
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19.发明授权公开(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
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).
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公开(公告)号：US09995923B2
公开(公告)日：2018-06-12
申请号：US15164052
申请日：2016-05-25
Applicant: HAMAMATSU PHOTONICS K.K.
Inventor： Koyo Watanabe , Takashi Inoue
CPC classification number: G02B21/365 , G02B21/06 , G02F1/0121
Abstract: A control apparatus includes a lens, an SLM presenting a modulation pattern on a modulation plane and outputting modulated light L2 for forming light spots P1 and P2 on a pupil plane of the lens, an imaging device imaging a fringe pattern image formed on a focal plane of the lens and generating image data Da indicating the fringe pattern image, a calculation unit calculating at least one kind of parameter among an intensity amplitude, a phase shift amount, and an intensity average from the image data Da, an analysis unit obtaining a deviation in relative positions of an optical axis of the lens and a reference coordinate of the modulation plane based on the parameter, and a changing unit changing an origin position of the reference coordinate so that the deviation in the relative positions is decreased.
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