Patents by Inventor Masaki Tsunekane
Masaki Tsunekane 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: 11067438Abstract: A laser beam profile measurement device includes: a plate-like or block-like fluorescence generation element including an incidence surface on which a laser light is incident and an emission surface from which the laser light is emitted; a light separation element for separating fluorescence from the laser light, the fluorescence generated in the fluorescence generation element and emitted from the emission surface; and an image element for receiving the fluorescence. The fluorescence generation element includes a first film formed on the incidence surface thereof. The first film has a wavelength-to-reflectance characteristic of transmitting a wavelength ?1 of the laser light and reflecting a wavelength ?2 of the fluorescence. The first film has a wavelength-to-reflectance characteristic of transmitting a wavelength ?1 of the laser light and reflecting a wavelength ?2 of the fluorescence.Type: GrantFiled: July 27, 2017Date of Patent: July 20, 2021Assignee: CANARE ELECTRIC CO., LTD.Inventor: Masaki Tsunekane
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Publication number: 20200209058Abstract: A laser beam profile measurement device includes: a plate-like or block-like fluorescence generation element including an incidence surface on which a laser light is incident and an emission surface from which the laser light is emitted; a light separation element for separating fluorescence from the laser light, the fluorescence generated in the fluorescence generation element and emitted from the emission surface; and an image element for receiving the fluorescence. The fluorescence generation element includes a first film formed on the incidence surface thereof. The first film has a wavelength-to-reflectance characteristic of transmitting a wavelength ?1 of the laser light and reflecting a wavelength ?2 of the fluorescence. The first film has a wavelength-to-reflectance characteristic of transmitting a wavelength ?1 of the laser light and reflecting a wavelength ?2 of the fluorescence.Type: ApplicationFiled: July 27, 2017Publication date: July 2, 2020Inventor: Masaki TSUNEKANE
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Publication number: 20130186362Abstract: A laser ignition system that is mounted on an internal combustion engine and that condenses a laser beam oscillated from a laser oscillator into an engine combustion chamber by using a condenser lens to generate a flame kernel with high energy and to perform ignition includes at least a highly-refractive optical element that refracts optical axes OPX1 to OPXn of plural laser beams oscillated from plural semiconductor lasers 5-1 to 5-n through a resonator to change traveling directions of the laser beams and a condenser device that condenses the laser beams refracted by the highly-refractive optical element on plural positions FP1 to FPn in the engine combustion chamber.Type: ApplicationFiled: September 20, 2011Publication date: July 25, 2013Applicants: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION, NATIONAL INSTITUTES OF NATURAL SCIENCES, NIPPON SOKEN, INC.Inventors: Kenji Kanehara, Nicolaie Pavel, Takunori Taira, Masaki Tsunekane
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Patent number: 8223813Abstract: A compact semiconductor laser pumped solid-state laser device is provided that can suppress unnecessary parasitic oscillation in a microchip and efficiently extract energy.Type: GrantFiled: January 11, 2011Date of Patent: July 17, 2012Assignee: Inter-University Research Institute Corporation, National Institutes of Natural SciencesInventors: Masaki Tsunekane, Takunori Taira
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Publication number: 20110176566Abstract: A compact semiconductor laser pumped solid-state laser device is provided that can suppress unnecessary parasitic oscillation in a microchip and efficiently extract energy.Type: ApplicationFiled: January 11, 2011Publication date: July 21, 2011Applicant: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION, NATIONAL INSTITUTES OF NATURAL SCIENCESInventors: Masaki Tsunekane, Takunori Taira
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Publication number: 20110150026Abstract: There is provided a semiconductor laser pumped solid-state laser device for engine ignition that can stably provide optical energy required for ignition across a wide temperature range. In the semiconductor laser pumped solid-state laser device for engine ignition, a plurality of semiconductor lasers 21, 22, 23, and 24 are used that have locking ranges, a temperature width thereof divided into a plurality of temperature ranges corresponding to a variation width of an ambient temperature, and that have the respective wavelengths falling within an absorption wavelength band of a solid-state laser medium 5 of the solid-state laser device in the temperature width of each locking range, to pump the solid-state laser medium 5 by multiplexing emitted lights from the plurality of semiconductor lasers 21, 22, 23, and 24 using a multiplexing mechanism to irradiate the solid-state laser medium 5.Type: ApplicationFiled: December 15, 2010Publication date: June 23, 2011Applicants: INTER-UNIVERSITY RESEARCH INSTITUTE CORPORATION, NATIONAL INSTITUTES OF NATURAL SCIENCES, NIPPON SOKEN, INC.Inventors: Masaki Tsunekane, Takunori Taira, Kenji Kanehara
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Patent number: 7496125Abstract: As a composite laser rod capable of satisfying the positional stability and output stability of a laser beam, a laser rod in which a laser active element is doped is intimately inserted into a hollow portion of a non-doped ceramic pipe that has a crystal structure the same as the laser rod followed by baking so as to remove a gap and strain at an interface between the laser rod and the ceramic pipe after the baking further followed by polishing a surface of the ceramic pipe to form a ceramic skin layer, and thereby a composite laser rod is formed. In the composite laser rod, an influence due to fluctuation in the cooling capacity of cooling water or a heat sink is averaged by a non-doped skin layer, temperature fluctuation of the laser rod is suppressed, and an influence of vibration from the cooling water or a cooling fan can be suppressed.Type: GrantFiled: November 17, 2006Date of Patent: February 24, 2009Assignee: Konoshima Chemical Co. Ltd.Inventors: Hikaru Kouta, Yoshikazu Suzuki, Shuetsu Kudo, Masaki Tsunekane, Katsuji Mukaihara, Takagimi Yanagitani, Hideki Yagi
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Publication number: 20070280317Abstract: As a composite laser rod capable of satisfying the positional stability and output stability of a laser beam, a laser rod in which a laser active element is doped is intimately inserted into a hollow portion of a non-doped ceramic pipe that has a crystal structure the same as the laser rod followed by baking so as to remove a gap and strain at an interface between the laser rod and the ceramic pipe after the baking further followed by polishing a surface of the ceramic pipe to form a ceramic skin layer, and thereby a composite laser rod is formed. In the composite laser rod, an influence due to fluctuation in the cooling capacity of cooling water or a heat sink is averaged by a non-doped skin layer, temperature fluctuation of the laser rod is suppressed, and an influence of vibration from the cooling water or a cooling fan can be suppressed.Type: ApplicationFiled: November 17, 2006Publication date: December 6, 2007Inventors: Hikaru KOUTA, Yoshikazu Suzuki, Shuetsu Kudo, Masaki Tsunekane, Katsuji Mukaihara, Takagimi Yanagitani, Hideki Yagi
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Patent number: 7233611Abstract: A conventional method for a solid-state laser device that obtains a laser beam output of a high quality at a high output using a laser diode as a pumping light source has a problem that the costs are increased and the fabrication becomes complicated due to an increasing number of components, such as a diffusing reflection mirror, a condenser lens, and a holding mechanism and a cooling mechanism thereof. Coating with a antireflection coating to reduce a transmission loss of laser diode light, and coating with a high reflection coating to reflect the laser diode light are provided alternately on the outer surface of a cooling tube. Also, an irradiation direction of the laser diode is not directed to the center of the laser rod, but is given with a certain angle to be positively tilted. This configuration makes it possible to eliminate the above problem.Type: GrantFiled: November 19, 2003Date of Patent: June 19, 2007Assignee: Laserfront Technologies, Inc.Inventors: Katsuji Mukaihara, Masaki Tsunekane
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Patent number: 7158546Abstract: As a composite laser rod capable of satisfying the positional stability and output stability of a laser beam, a laser rod in which a laser active element is doped is intimately inserted into a hollow portion of a non-doped ceramic pipe that has a crystal structure the same as the laser rod followed by baking so as to remove a gap and strain at an interface between the laser rod and the ceramic pipe after the baking further followed by polishing a surface of the ceramic pipe to form a ceramic skin layer, and thereby a composite laser rod is formed. In the composite laser rod, an influence due to fluctuation in the cooling capacity of cooling water or a heat sink is averaged by a non-doped skin layer, temperature fluctuation of the laser rod is suppressed, and an influence of vibration from the cooling water or a cooling fan can be suppressed.Type: GrantFiled: February 26, 2003Date of Patent: January 2, 2007Assignees: NEC Corporation, Konoshima Chemical Co., Ltd.Inventors: Hikaru Kouta, Yoshikazu Suzuki, Shuetsu Kudo, Masaki Tsunekane, Katsuji Mukaihara, Takagimi Yanagitani, Hideki Yagi
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Patent number: 7130323Abstract: A semiconductor laser device in a semiconductor-laser excited solid-state laser apparatus is provided with a plurality of semiconductor laser diodes connected in series to one another. Each of a plurality of bypass diodes is connected in parallel to each semiconductor laser diode or each group of at least two semiconductor laser diodes in the plurality of semiconductor laser diodes and has a higher rising voltage than a rising voltage of the parallel-connected semiconductor laser diodes. The polarity of one end of each of the semiconductors laser diode is the same as the polarity of that end of the associated bypass diode which is connected to the one end of that semiconductor laser diode and the polarity of the other end of the semiconductor laser diode is the same as the polarity of that end of the associated bypass diode which is connected to the other end of that semiconductor laser diode.Type: GrantFiled: February 18, 2004Date of Patent: October 31, 2006Assignee: NEC CorporationInventor: Masaki Tsunekane
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Publication number: 20060215715Abstract: A pair of opening portions are provided as an inlet port of refrigerant and an outlet port thereof, and refrigerant flow channels are formed left-right symmetrically in its plan view from one opening portion to the other opening portion. At the area adjusted to the area which is thermally connected to the heating element in the refrigerant flow channels, projections whose cross section thereof become smaller and smaller upward from the bottom surface of the refrigerant flow channels or downward from the upper surface, that is, widens toward the end, are formed. By joining the heat radiating plate having the projections formed therein to the other heat radiating plate, which is plate-shaped, together, a heat sink is assembled. Therefore, the heat sinks are excellent in terms of thermal conductivity and reliability, are produced at a low cost, and a laser module employing the same, a laser module apparatus, and a laser processing apparatus are obtainable.Type: ApplicationFiled: February 18, 2004Publication date: September 28, 2006Inventors: Hikaru Kouta, Hisaya Takahashi, Kazuyuki Mikubo, Hideyuki Ono, Masaki Tsunekane, Toshinori Ishida, Keiichi Kubota
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Patent number: 6822985Abstract: A laser-diode-pumped solid-state laser apparatus includes a laser rod, and laser diode devices that generate pumping light. Optical unit such as a reflection mirror and an optical waveguide medium is provided at a position in a laser resonator near a laser optical axis and not blocking the optical axis. A photo-detector detects a quantity of fluorescence generated from solid-state laser medium. The fluorescence quantity is compared with a predetermined value or a previously measured value. Thus degradation status of a laser diode light source is constantly diagnosed.Type: GrantFiled: March 7, 2002Date of Patent: November 23, 2004Assignee: Laserfront Technologies, Inc.Inventors: Masaki Tsunekane, Katsuji Mukaihara
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Publication number: 20040161011Abstract: A semiconductor laser device in a semiconductor-laser excited solid-state laser apparatus is provided with a plurality of semiconductor laser diodes connected in series to one another. Each of a plurality of bypass diodes is connected in parallel to each semiconductor laser diode or each group of at least two semiconductor laser diodes in the plurality of semiconductor laser diodes and has a higher rising voltage than a rising voltage of the parallel-connected semiconductor laser diodes. The polarity of one end of each of the semiconductors laser diode is the same as the polarity of that end of the associated bypass diode which is connected to the one end of that semiconductor laser diode and the polarity of the other end of the semiconductor laser diode is the same as the polarity of that end of the associated bypass diode which is connected to the other end of that semiconductor laser diode.Type: ApplicationFiled: February 18, 2004Publication date: August 19, 2004Applicant: NEC CORPORATIONInventor: Masaki Tsunekane
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Publication number: 20040136430Abstract: A laser-pumped solid laser device includes a plurality of condensers extending parallel to one another and each including a solid laser rod and a glass tube receiving therein the solid laser rod, and a pair of rod supports for supporting the condensers in unison. The optical axes of the solid laser rods are coupled together by a mirror assembly in series to form an optical path. One end of the optical path is provided with a total-reflection mirror whereas the other end of the optical path is provided with a partial-reflection mirror for emitting laser therethrough.Type: ApplicationFiled: December 29, 2003Publication date: July 15, 2004Applicant: NEC CORPORATIONInventors: Masaki Tsunekane, Katsuji Mukaihara
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Publication number: 20040101004Abstract: A conventional method for a solid-state laser device that obtains a laser beam output of a high quality at a high output using a laser diode as a pumping light source has a problem that the costs are increased and the fabrication becomes complicated due to an increasing number of components, such as a diffusing reflection mirror, a condenser lens, and a holding mechanism and a cooling mechanism thereof. Coating with a antireflection coating to reduce a transmission loss of laser diode light, and coating with a high reflection coating to reflect the laser diode light are provided alternately on the outer surface of a cooling tube. Also, an irradiation direction of the laser diode is not directed to the center of the laser rod, but is given with a certain angle to be positively tilted. This configuration makes it possible to eliminate the above problem.Type: ApplicationFiled: November 19, 2003Publication date: May 27, 2004Inventors: Katsuji Mukaihara, Masaki Tsunekane
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Publication number: 20030214986Abstract: As a composite laser rod capable of satisfying the positional stability and output stability of a laser beam, a laser rod in which a laser active element is doped is intimately inserted into a hollow portion of a non-doped ceramic pipe that has a crystal structure the same as the laser rod followed by baking so as to remove a gap and strain at an interface between the laser rod and the ceramic pipe after the baking further followed by polishing a surface of the ceramic pipe to form a ceramic skin layer, and thereby a composite laser rod is formed. In the composite laser rod, an influence due to fluctuation in the cooling capacity of cooling water or a heat sink is averaged by a non-doped skin layer, temperature fluctuation of the laser rod is suppressed, and an influence of vibration from the cooling water or a cooling fan can be suppressed.Type: ApplicationFiled: February 26, 2003Publication date: November 20, 2003Applicant: NEC CORPORATION, KONOSHIMA CHEMICAL COMPANY, LTD.Inventors: Hikaru Kouta, Yoshikazu Suzuki, Shuetsu Kudo, Masaki Tsunekane, Katsuji Mukaihara, Takagimi Yanagitani, Hideki Yagi
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Patent number: 6532248Abstract: A diode-laser side-pumped solid-state laser device (SSLD) has a cylindrical laser rod, a cooling tube, and a cylindrical mirror member having an inner mirror surface and a plurality of openings therein for introducing pumping laser. The laser rod receives the pumping laser, absorbs a portion of the pumping laser, and passes and focus the remaining portion of the pumping laser at a focal point disposed on the mirror surface. Substantially all the remaining portion of the pumping laser is reflected to be received and absorbed by the laser rod.Type: GrantFiled: February 26, 2001Date of Patent: March 11, 2003Assignee: NEC CorporationInventors: Masaki Tsunekane, Shuetsu Kudo, Katsuji Mukaihara, Hideyuki Moribe, Takashi Ooyama
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Publication number: 20020126724Abstract: A laser-diode-pumped solid-state laser apparatus includes a laser rod, and laser diode devices that generate pumping light. Optical unit such as a reflection mirror and an optical waveguide medium is provided at a position in a laser resonator near a laser optical axis and not blocking the optical axis. A photo-detector detects a quantity of fluorescence generated from solid-state laser medium. The fluorescence quantity is compared with a predetermined value or a previously measured value. Thus degradation status of a laser diode light source is constantly diagnosed.Type: ApplicationFiled: March 7, 2002Publication date: September 12, 2002Applicant: NEC CORPORATIONInventors: Masaki Tsunekane, Katsuji Mukaihara
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Publication number: 20010033596Abstract: A diode-laser side-pumped solid-state laser device (SSLD) has a cylindrical laser rod, a cooling tube, and a cylindrical mirror member having an inner mirror surface and a plurality of openings therein for introducing pumping laser. The laser rod receives the pumping laser, absorbs a portion of the pumping laser, and passes and focus the remaining portion of the pumping laser at a focal point disposed on the mirror surface. Substantially all the remaining portion of the pumping laser is reflected to be received and absorbed by the laser rod.Type: ApplicationFiled: February 26, 2001Publication date: October 25, 2001Applicant: NEC CorporationInventors: Masaki Tsunekane, Shuetsu Kudo, Katsuji Mukaihara, Hideyuki Moribe, Takashi Ooyama