Patents by Inventor Junji Kawanaka
Junji Kawanaka 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: 9325149Abstract: A multi-beam combining apparatus includes a phase shifting section, a superposing section, an observing section and a phase control section. The phase shifting section generates a plurality of phase-shifted laser beams by shifting the phase of each of the plurality of laser beams. The superposing section generates a plurality of superposed laser beam by superposing the reference laser beam and each of the plurality of phase-shifted laser beams. The observing section generates interference pattern data of a spatial interference pattern which appears when observing each of the superposed laser beams. The phase control section carries out a feedback control of the phase shifts in the phase shifting section based on the interference pattern data obtained for every superposed laser beam, and thereby sets the plurality of phase-shifted laser beams to desired states.Type: GrantFiled: January 17, 2013Date of Patent: April 26, 2016Assignees: Mitsubishi Heavy Industries, Ltd., Institute for Laser Technology, Osaka UniversityInventors: Koichi Hamamoto, Takahiro Yamada, Haik Chosrowjan, Hiroaki Furuse, Masayuki Fujita, Yasukazu Izawa, Junji Kawanaka, Noriaki Miyanaga
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Publication number: 20150138618Abstract: A multi-beam combining apparatus includes a phase shifting section, a superposing section, an observing section and a phase control section. The phase shifting section generates a plurality of phase-shifted laser beams by shifting the phase of each of the plurality of laser beams. The superposing section generates a plurality of superposed laser beam by superposing the reference laser beam and each of the plurality of phase-shifted laser beams. The observing section generates interference pattern data of a spatial interference pattern which appears when observing each of the superposed laser beams. The phase control section carries out a feedback control of the phase shifts in the phase shifting section based on the interference pattern data obtained for every superposed laser beam, and thereby sets the plurality of phase-shifted laser beams to desired states.Type: ApplicationFiled: January 17, 2013Publication date: May 21, 2015Applicants: Mitsubishi Heavy Industries, Ltd., Institute for Laser Technology, OSAKA UNIVERSITYInventors: Koichi Hamamoto, Takahiro Yamada, Haik Chosrowjan, Hiroaki Furuse, Masayuki Fujita, Yasukazu Izawa, Junji Kawanaka, Noriaki Miyanaga
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Patent number: 8259763Abstract: A laser gain medium includes an optical medium configured to transmit a laser beam and having an incident face, a first face, a second face opposing to the first face; and gain media configured to amplify the laser beam while reflecting the laser beam. At least one of the gain media is joined on a first face of the optical medium as a first face gain medium, and at least one of the remaining gain media is joined on a second face of the optical medium as a second face gain medium. The laser beam is incident into the optical medium, and is amplified by the first face gain medium and the second face gain medium while being alternately reflected by the first face gain medium and the second face gain medium.Type: GrantFiled: September 23, 2011Date of Patent: September 4, 2012Assignees: Mitsubishi Heavy Industries, Ltd., Osaka UniversityInventors: Kenji Takeshita, Shinya Ishii, Tomoko Saito, Junji Kawanaka, Noriaki Miyanaga, Kazuo Imazaki, Taku Saiki, Hiroaki Furuse
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Publication number: 20120008654Abstract: A laser gain medium includes an optical medium configured to transmit a laser beam and having an incident face, a first face, a second face opposing to the first face; and gain media configured to amplify the laser beam while reflecting the laser beam. At least one of the gain media is joined on a first face of the optical medium as a first face gain medium, and at least one of the remaining gain media is joined on a second face of the optical medium as a second face gain medium. The laser beam is incident into the optical medium, and is amplified by the first face gain medium and the second face gain medium while being alternately reflected by the first face gain medium and the second face gain medium.Type: ApplicationFiled: September 23, 2011Publication date: January 12, 2012Applicants: OSAKA UNIVERSITY, MITSUBISHI HEAVY INDUSTRIES, LTD.Inventors: Kenji TAKESHITA, Shinya ISHII, Tomoko SAITO, Junji KAWANAKA, Noriaki MIYANAGA, Kazuo IMAZAKI, Taku SAIKI, Hiroaki FURUSE
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Patent number: 8068523Abstract: A laser gain medium includes an optical medium configured to transmit a laser beam and having an incident face, a first face, a second face opposing to the first face; and gain media configured to amplify the laser beam while reflecting the laser beam. At least one of the gain media is joined on a first face of the optical medium as a first face gain medium, and at least one of the remaining gain media is joined on a second face of the optical medium as a second face gain medium. The laser beam is incident into the optical medium, and is amplified by the first face gain medium and the second face gain medium while being alternately reflected by the first face gain medium and the second face gain medium.Type: GrantFiled: July 24, 2009Date of Patent: November 29, 2011Assignees: Mitsubishi Heavy Industries, Ltd., Osaka UniversityInventors: Kenji Takeshita, Shinya Ishii, Tomoko Saito, Junji Kawanaka, Noriaki Miyanaga, Kazuo Imazaki, Taku Saiki, Hiroaki Furuse
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Publication number: 20100111121Abstract: A laser gain medium includes an optical medium configured to transmit a laser beam and having an incident face, a first face, a second face opposing to the first face; and gain media configured to amplify the laser beam while reflecting the laser beam. At least one of the gain media is joined on a first face of the optical medium as a first face gain medium, and at least one of the remaining gain media is joined on a second face of the optical medium as a second face gain medium. The laser beam is incident into the optical medium, and is amplified by the first face gain medium and the second face gain medium while being alternately reflected by the first face gain medium and the second face gain medium.Type: ApplicationFiled: July 24, 2009Publication date: May 6, 2010Applicants: MITSUBISHI HEAVY INDUSTRIES, LTD., OSAKA UNIVERSITYInventors: Kenji Takeshita, Shinya Ishii, Tomoko Saito, Junji Kawanaka, Noriaki Miyanaga, Kazuo Imazaki, Taku Saiki, Hiroaki Furuse
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Publication number: 20050232318Abstract: A method and an apparatus capable of efficient laser amplification by cooling a semiconductor laser pumped, ytterbium doped YAG crystal to a temperature between 8 K and 230 K.Type: ApplicationFiled: January 19, 2005Publication date: October 20, 2005Applicant: Japan Atomic Energy Research InstituteInventors: Junji Kawanaka, Masayuki Fujita, Yasukazu Izawa