Patents by Inventor Katsuji Mukaihara
Katsuji Mukaihara 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: 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: 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: 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