Patents by Inventor Koyo WATANABE
Koyo WATANABE has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 12204182Abstract: 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.Type: GrantFiled: August 3, 2023Date of Patent: January 21, 2025Assignee: HAMAMATSU PHOTONICS K.K.Inventors: Koyo Watanabe, Takashi Inoue
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Publication number: 20240364079Abstract: A method for designing a phase modulation layer of a light emitting element as an iPMSEL including a light emitting portion and the phase modulation layer optically coupled to the light emitting portion includes a generation step for generating a design pattern of the phase modulation layer. The phase modulation layer includes a base layer and a plurality of different refractive index regions having different refractive indices from the base layer and distributed two-dimensionally in a plane perpendicular to a thickness direction of the phase modulation layer.Type: ApplicationFiled: May 19, 2022Publication date: October 31, 2024Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Kazuyoshi HIROSE, Koyo WATANABE, Hiroki KAMEI
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Publication number: 20240361620Abstract: A data generation method of the present disclosure is a method for generating data for controlling a spatial light modulator. The data generation method includes: preparing a plurality of initial phase spectrum functions; generating each of a plurality of pieces of preliminary data for controlling the spatial light modulator by using each of the plurality of initial phase spectrum functions; and selecting at least one of the plurality of pieces of preliminary data and setting the at least one piece of preliminary data as the data for controlling the spatial light modulator.Type: ApplicationFiled: April 24, 2024Publication date: October 31, 2024Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Koyo WATANABE, Takashi INOUE
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Publication number: 20240361664Abstract: An optical pulse train generation device includes a storage unit and a characteristic setting unit. The storage unit stores a plurality of phase patterns in advance. The plurality of phase patterns are phase patterns for forming, from a first optical pulse, an optical pulse train including a plurality of second optical pulses having time differences therebetween and having different center wavelengths. Between the plurality of phase patterns, one or both of a first characteristic regarding the first optical pulse and a second characteristic regarding the optical pulse train are different. The characteristic setting unit sets the first characteristic and the second characteristic in response to the user's input. The storage unit stores the plurality of phase patterns in association with the first characteristic and the second characteristic. A spatial light modulator displays a phase pattern corresponding to the first characteristic and the second characteristic set by the characteristic setting unit.Type: ApplicationFiled: April 17, 2024Publication date: October 31, 2024Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Koyo WATANABE, Takashi INOUE
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Publication number: 20240210275Abstract: 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.Type: ApplicationFiled: March 14, 2022Publication date: June 27, 2024Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Koyo WATANABE, Hisanari TAKAHASHI, Takashi INOUE
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Publication number: 20240201046Abstract: 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.Type: ApplicationFiled: March 14, 2022Publication date: June 20, 2024Applicants: HAMAMATSU PHOTONICS K.K., HAMAMATSU PHOTONICS K.K.Inventors: Koyo WATANABE, Hisanari TAKAHASHI, Takashi INOUE
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Publication number: 20240192082Abstract: 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.Type: ApplicationFiled: March 14, 2022Publication date: June 13, 2024Applicants: HAMAMATSU PHOTONICS K.K., HAMAMATSU PHOTONICS K.K.Inventors: Koyo WATANABE, Hisanari TAKAHASHI, Takashi INOUE
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Publication number: 20240162679Abstract: A light-emitting device is an S-iPM laser of M-point oscillation including a phase modulation layer. Four-direction in-plane wavenumber vectors each including a wavenumber spread corresponding to an angular spread of light output from the light-emitting device are formed on a reciprocal lattice space of the phase modulation layer. The magnitude of at least one of the in-plane wavenumber vectors is smaller than 2?/?. A predetermined phase distribution included in the phase modulation layer includes an element for focusing the light output.Type: ApplicationFiled: March 2, 2022Publication date: May 16, 2024Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Kazuyoshi HIROSE, Koyo WATANABE, Hiroki KAMEI
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Patent number: 11960317Abstract: An intensity spectrum designing unit of a data generating device includes an initial value setting unit that sets a plurality of objects of a first generation of an intensity spectrum function A(?) and a phase spectrum function ?(?), an evaluation value calculating unit that calculates an evaluation value for each of a plurality of objects of an n-th generation, an object selecting unit that selects two or more objects used for generating a plurality of objects of an (n+1)-th generation among objects of the n-th generation on the basis of superiority of the evaluation value, and a next-generation generating unit that generates a plurality of objects of the (n+1)-th generation on the basis of the selected two or more objects. The evaluation value calculating unit, the object selecting unit, and the next-generation generating unit repeat processes while 1 is added to n until a predetermined condition is satisfied.Type: GrantFiled: February 15, 2019Date of Patent: April 16, 2024Assignee: HAMAMATSU PHOTONICS K.K.Inventors: Koji Takahashi, Koyo Watanabe, Takashi Inoue
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Publication number: 20240110833Abstract: 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.Type: ApplicationFiled: December 6, 2023Publication date: April 4, 2024Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Koyo WATANABE, Hisanari TAKAHASHI, Kyohei SHIGEMATSU, Takashi INOUE
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Patent number: 11913836Abstract: 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.Type: GrantFiled: September 29, 2021Date of Patent: February 27, 2024Assignee: HAMAMATSU PHOTONICS K.K.Inventors: Koyo Watanabe, Hisanari Takahashi, Kyohei Shigematsu, Takashi Inoue
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Publication number: 20240003744Abstract: 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.Type: ApplicationFiled: September 15, 2023Publication date: January 4, 2024Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Koyo WATANABE, Kyohei SHIGEMATSU, Takashi INOUE
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Publication number: 20230384624Abstract: 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.Type: ApplicationFiled: August 3, 2023Publication date: November 30, 2023Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Koyo WATANABE, Takashi INOUE
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Patent number: 11821793Abstract: 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.Type: GrantFiled: March 27, 2020Date of Patent: November 21, 2023Assignee: HAMAMATSU PHOTONICS K.K.Inventors: Koyo Watanabe, Kyohei Shigematsu, Takashi Inoue
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Publication number: 20230333007Abstract: 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.Type: ApplicationFiled: July 5, 2021Publication date: October 19, 2023Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Koyo WATANABE, Hisanari TAKAHASHI, Kyohei SHIGEMATSU, Takashi INOUE
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Publication number: 20230304923Abstract: 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.Type: ApplicationFiled: March 13, 2023Publication date: September 28, 2023Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Hisanari TAKAHASHI, Koyo WATANABE, Hiroshi SATOZONO, Kyohei SHIGEMATSU, Takashi INOUE
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Publication number: 20230304926Abstract: 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.Type: ApplicationFiled: March 13, 2023Publication date: September 28, 2023Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Hisanari TAKAHASHI, Koyo WATANABE, Hiroshi SATOZONO, Kyohei SHIGEMATSU, Takashi INOUE
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Patent number: 11762225Abstract: 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.Type: GrantFiled: January 2, 2020Date of Patent: September 19, 2023Assignee: HAMAMATSU PHOTONICS K.K.Inventors: Koyo Watanabe, Takashi Inoue
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Publication number: 20230168487Abstract: A light irradiation apparatus focuses light on a surface or an inside of an object to observe or process the object, and includes a laser light source, a lens, a lens, a mask, a wave plate, and a lens. The mask is a multi-ring mask for spatially intensity-modulating input light in a beam cross-section and outputting modulated light, and includes a plurality of ring-shaped light-shielding areas provided around a center position, and a transmitting area provided between two adjacent light-shielding areas out of the plurality of light-shielding areas. A radial width of each of the two adjacent light-shielding areas out of the plurality of light-shielding areas is larger than a radial width of the transmitting area provided between the two light-shielding areas.Type: ApplicationFiled: January 20, 2021Publication date: June 1, 2023Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Naoya MATSUMOTO, Koyo WATANABE
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Publication number: 20220236416Abstract: 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.Type: ApplicationFiled: January 6, 2022Publication date: July 28, 2022Applicant: HAMAMATSU PHOTONICS K.K.Inventors: Hisanari TAKAHASHI, Koyo WATANABE, Hiroshi SATOZONO, Takashi INOUE