Patents by Inventor Kazuhiko Misawa
Kazuhiko Misawa 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: 11909164Abstract: An optical pulse pair generator is configured to generate an optical pulse pair including a first pulse beam and a second pulse beam having respective central wavelengths that are separated by a predetermined wavelength difference from each other and having target time waveforms that are substantially the same as each other. The optical pulse pair generator provided includes a splitter section configured to split an incident pulse beam into two, a first shaping section configured to shape one of the pulse beams split by the splitter section by shaping into the target time waveform and setting a central frequency so as to configure the first pulse beam, and a second shaping section configured to shape the other of the pulse beams split by the splitter section by shaping into the target time waveform so as to configure the second pulse beam.Type: GrantFiled: April 19, 2019Date of Patent: February 20, 2024Assignee: NATIONAL UNIVERSITY CORPORATION TOKYO UNIVERSITY OF AGRICULTURE AND TECHNOLOGYInventors: Kazuhiko Misawa, Terumasa Ito
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Publication number: 20230100591Abstract: There is provided a light detecting device including: a laser light source generating light source pulse beam; a splitting section splitting the light source pulse beam into excitation beam, first probe beam and second probe beam; a first modulating section executing optical path length modulation that modulates a relative optical path length difference between the excitation beam, and the first probe beam and the second probe beam; a second modulating section phase-modulating the first probe beam; and a detecting section illuminating combined beam, in which the excitation beam, the first probe beam and the second probe beam are multiplexed, onto a sample, and detecting a stimulated Raman scattering signal that is generated.Type: ApplicationFiled: February 26, 2021Publication date: March 30, 2023Applicant: National University Corporation Tokyo University of Agriculture and TechnologyInventors: Kazuhiko Misawa, Terumasa Ito
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Publication number: 20230026894Abstract: Provided is a light detection device having a laser light source, a splitting unit, a first modulation unit, a second modulation unit, a first detection unit and a second detection unit that detect light, and a control unit.Type: ApplicationFiled: December 24, 2020Publication date: January 26, 2023Applicant: National University Corporation Tokyo University of Agriculture and TechnologyInventors: Kazuhiko Misawa, Terumasa Ito
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Publication number: 20210218215Abstract: An optical pulse pair generator is configured to generate an optical pulse pair including a first pulse beam and a second pulse beam having respective central wavelengths that are separated by a predetermined wavelength difference from each other and having target time waveforms that are substantially the same as each other. The optical pulse pair generator provided includes a splitter section configured to split an incident pulse beam into two, a first shaping section configured to shape one of the pulse beams split by the splitter section by shaping into the target time waveform and setting a central frequency so as to configure the first pulse beam, and a second shaping section configured to shape the other of the pulse beams split by the splitter section by shaping into the target time waveform so as to configure the second pulse beam.Type: ApplicationFiled: April 19, 2019Publication date: July 15, 2021Applicant: National University Corporation Tokyo University of Agriculture and TechnologyInventors: Kazuhiko Misawa, Terumasa Ito
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Patent number: 9778196Abstract: A phase sensitive detection mechanism that uses electrical processing is realized, and an optical detection device, an optical detection method, and a program that are capable of detecting faint light at high speed and with high sensitivity are provided by a simple configuration. A light source section generates a first pulsed light. A filter section transmits a second pulsed light formed from a portion of a frequency spectrum exhibited by the first pulsed light, and reflects a third pulsed light formed from another portion of the frequency spectrum exhibited by the first pulsed light. A phase modulation section phase modulates the second pulsed light at plural phases. A multiplexing section produces a fourth pulsed light by multiplexing the third pulsed light with the second pulsed light phase modulated by the phase modulation section. A detector spectrally disperses and detects scattered light generated by radiating the fourth pulsed light onto a target object.Type: GrantFiled: February 10, 2015Date of Patent: October 3, 2017Assignee: National University Corporation Tokyo University of Agriculture and TechnologyInventors: Takayuki Suzuki, Kazuhiko Misawa, Yuki Obara
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Publication number: 20160370297Abstract: A phase sensitive detection mechanism that uses electrical processing is realized, and an optical detection device, an optical detection method, and a program that are capable of detecting faint light at high speed and with high sensitivity are provided by a simple configuration. A light source section generates a first pulsed light. A filter section transmits a second pulsed light formed from a portion of a frequency spectrum exhibited by the first pulsed light, and reflects a third pulsed light formed from another portion of the frequency spectrum exhibited by the first pulsed light. A phase modulation section phase modulates the second pulsed light at plural phases. A multiplexing section produces a fourth pulsed light by multiplexing the third pulsed light with the second pulsed light phase modulated by the phase modulation section. A detector spectrally disperses and detects scattered light generated by radiating the fourth pulsed light onto a target object.Type: ApplicationFiled: February 10, 2015Publication date: December 22, 2016Inventors: Takayuki Suzuki, Kazuhiko Misawa, Yuki Obara
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Patent number: 7265848Abstract: A time resolved, nonlinear complex susceptibility measuring apparatus (1) that is capable of measurement unaffected by any distortion of the wave front of a probe light whereby a temporal change in the nonlinear complex susceptibility of a nonlinear optical material that occurs when it is irradiated with a light pulse in a femtosecond range is measured using a pair of polarized lights orthogonal to each other which are formed by splitting a single light pulse into a reference and a probe light (5) and (6) in a polarized light splitting Sagnac type interference light path (8). A direction of polarization converting mechanism for rotating a direction of polarization of the reference and probe lights by an angle of 90° in the polarized light splitting Sagnac type interference light path is included to align the directions of polarization on a test specimen (3).Type: GrantFiled: September 19, 2003Date of Patent: September 4, 2007Assignee: Japan Science and TechnologyInventors: Kazuhiko Misawa, Fumikazu Inuzuka, Hiroyoshi Lang
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Patent number: 7165851Abstract: A linear opto-frequency chirp amount variable apparatus using a dielectric multilayer film mirror, which does not require the optical axis to be realigned each time the amount of a chirp is to be varied includes a pair of opposed, parallel, dielectric, multilayer film mirrors, and a movable mirror between the dielectric multilayer film mirrors. The movable mirror is inclined so that oblique, incident light, projected into the space between the two dielectric multilayer film mirrors, is reflected between them a plurality of times and then is reflected by the movable mirror into a direction parallel to the dielectric multilayer film mirror surfaces and in an incidence plane defined by the incident light and a plane-normal to each dielectric multilayer film mirror and toward the incident light. Moving the movable mirror forwards and backwards, parallel to the multilayer film mirrors changes the amount of a chirp.Type: GrantFiled: March 23, 2004Date of Patent: January 23, 2007Assignee: Japan Science and Technology AgencyInventors: Isao Matsuda, Kazuhiko Misawa, Hiroyoshi Lang
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Publication number: 20060181789Abstract: A linear opto-frequency chirp amount variable apparatus using a dielectric multilayer film mirror which does not require the optical axis to be realigned each time the amount of a chirp is to be varied, comprises a pair of dielectric multilayer film mirrors (2) and (2) arranged so that their mirror surfaces (2a) and (2a) extends parallel, and are opposed, to each other, and a movable mirror (4) disposed in a space defined between the dielectric multilayer film mirrors (2) and (2).Type: ApplicationFiled: March 23, 2004Publication date: August 17, 2006Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Isao Matsuda, Kazuhiko Misawa, Hiroyoshi Lang
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Publication number: 20060033930Abstract: A time resolved, nonlinear complex susceptibility measuring apparatus (1) that is capable of measurement unaffected by any distortion of the wave front of a probe light whereby a temporal change in the nonlinear complex susceptibility of a nonlinear optical material that occurs when it is irradiated with a light pulse in a femtosecond range is measured using a pair of polarized lights orthogonal to each other which are formed by splitting a single light pulse into a reference and a probe light (5) and (6) in a polarized light splitting Sagnac type interference light path (8). A direction of polarization converting mechanism for rotating a direction of polarization of the reference and probe lights by an angle of 90° in the polarized light splitting Sagnac type interference light path is included to align the directions of polarization on a test specimen (3).Type: ApplicationFiled: September 19, 2003Publication date: February 16, 2006Applicant: JAPAN SCIENCE AND TECHNOLOGY AGENCYInventors: Kazuhiko Misawa, Fumikazu Inuzuka, Hiroyoshi Lang
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Patent number: 6444300Abstract: A cyanine pigment and a polyvinylalcohol are dissolved into a water to make a mezzo-J-association body dispersed solution. Then, the mezzo-J-association body dispersed solution is maintained at a high viscosity by holding the solution at a given temperature. Subsequently, the mezzo-J-association body dispersed solution is dropped onto a given substrate and thereafter, rubbed. Thereby, the J-association body oriented dispersion film having the J-association bodies composed of the associated and oriented cyanine pigments in polarization can be obtained.Type: GrantFiled: September 13, 2000Date of Patent: September 3, 2002Assignee: The University of TokyoInventors: Takayoshi Kobayashi, Kazuhiko Misawa