Patents by Inventor Yoshihiro Emori

Yoshihiro Emori 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).

  • Publication number: 20190089113
    Abstract: A fiber laser apparatus that generates invisible laser light using an amplification optical fiber having a core and that propagates a fundamental mode and a low-order mode is provided. The fiber laser apparatus includes a visible laser light source that generates visible laser light, an introducing section that introduces the visible laser light generated by the visible laser light source into a core of the amplification optical fiber, a cladding light attenuating section that attenuates light which has propagated through a cladding of the amplification optical fiber, at a subsequent stage of the amplification optical fiber, and a drive unit that drives the visible laser light source to emit the visible laser light through a core of the output optical fiber in a case of performing alignment of an irradiation position of the invisible laser light with respect to a workpiece.
    Type: Application
    Filed: November 16, 2018
    Publication date: March 21, 2019
    Inventors: Kosuke KASHIWAGI, Akira FUJISAKI, Yoshihiro EMORI
  • Patent number: 10141708
    Abstract: A fiber laser apparatus that generates invisible laser light using an amplification optical fiber having a single-mode core and outputs the invisible laser light via an output optical fiber is provided. The fiber laser apparatus includes a visible laser light source that generates visible laser light, an introducing section that introduces the visible laser light generated by the visible laser light source into a core of one of the amplification optical fiber and the output optical fiber, and a drive unit that drives, in a case of performing alignment of an irradiation position of the invisible laser light with respect to a workpiece, the visible laser light source and emits the visible laser light via the core of the output optical fiber.
    Type: Grant
    Filed: July 17, 2013
    Date of Patent: November 27, 2018
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Kosuke Kashiwagi, Akira Fujisaki, Yoshihiro Emori
  • Patent number: 9690050
    Abstract: A laser unit includes: multi-mode semiconductor lasers configured to output laser lights in multi-mode; an optical multiplexer configured to multiplex and output the laser lights; a multi-mode optical fiber configured to connect the multi-mode semiconductor lasers to the optical multiplexer, and including a core portion, a cladding portion, and a coated portion; a first bending portion formed to the multi-mode optical fiber and bent with a predetermined bending length and at a predetermined first bending radius; a radiation portion formed outside the coated portion at the first bending portion, and configured to radiate heat of the multi-mode optical fiber; and a second bending portion formed to the multi-mode optical fiber between the first bending portion and the optical multiplexer and bent at a predetermined second bending radius, wherein increase in a temperature at the second bending portion is restrained by radiation from the radiation portion.
    Type: Grant
    Filed: June 7, 2016
    Date of Patent: June 27, 2017
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Kousuke Kashiwagi, Yoshihiro Emori, Kanji Tanaka
  • Publication number: 20170110847
    Abstract: An optical fiber laser device generates laser light by using an optical amplifying fiber as an amplification medium in a laser oscillator and includes: an optical outputting fiber configured to emit laser light to an outside; a return-light-attenuating portion configured to perform an attenuation process to return light propagating through at least the optical outputting fiber in a reverse direction of the laser light; a thermal conversion unit provided at the return-light-attenuating portion and configured to convert the return light into heat; a temperature-monitoring device configured to measure an increase in a temperature, of the return-light-attenuating portion, caused by the heat converted by the thermal conversion unit; and a control unit configured to decrease or stop an output of the laser light when the temperature measured by the temperature-monitoring device becomes a predetermined threshold temperature or higher.
    Type: Application
    Filed: December 29, 2016
    Publication date: April 20, 2017
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Koji KAJIWARA, Takeshi TAKAGI, Kousuke KASHIWAGI, Kazuaki HYUGA, Yoshihiro EMORI
  • Publication number: 20160291252
    Abstract: A laser unit includes: multi-mode semiconductor lasers configured to output laser lights in multi-mode; an optical multiplexer configured to multiplex and output the laser lights; a multi-mode optical fiber configured to connect the multi-mode semiconductor lasers to the optical multiplexer, and including a core portion, a cladding portion, and a coated portion; a first bending portion formed to the multi-mode optical fiber and bent with a predetermined bending length and at a predetermined first bending radius; a radiation portion formed outside the coated portion at the first bending portion, and configured to radiate heat of the multi-mode optical fiber; and a second bending portion formed to the multi-mode optical fiber between the first bending portion and the optical multiplexer and bent at a predetermined second bending radius, wherein increase in a temperature at the second bending portion is restrained by radiation from the radiation portion.
    Type: Application
    Filed: June 7, 2016
    Publication date: October 6, 2016
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Kousuke KASHIWAGI, Yoshihiro EMORI, Kanji TANAKA
  • Patent number: 9281654
    Abstract: A Raman amplifier using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, to output pumping lights having different central wavelengths, an interval between adjacent central wavelengths greater than 6 nm and smaller than 35 nm. An optical repeater is adapted to compensate loss in an optical fiber transmission line by the Raman amplifier. A Raman amplification method wherein the shorter the central wavelength of the pumping light, the higher light power of the pumping light. In the Raman amplifier, a certain pumping 1 wavelength being a first channel, and second to n-th channels are arranged with an interval of about 1 THz toward a longer wavelength side, pumping lights having wavelengths corresponding to the first to n-th channels are multiplexed, and pumping light having a wavelength spaced apart from the n-th channel by 2 THz or more toward the longer wavelength side is combined with the multiplexed light, thereby forming the pumping light source.
    Type: Grant
    Filed: April 9, 2013
    Date of Patent: March 8, 2016
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Youichi Akasaka, Yoshihiro Emori, Shu Namiki
  • Patent number: 9190802
    Abstract: An optical fiber laser device includes optical reflectors making an invisible laser light from an amplification optical fiber; a light source outputting a visible light; an introduction unit outputting the laser light input to a first input terminal from a first output terminal mainly, outputting the visible light input to a second input terminal from the first output terminal mainly, inputting the visible light output by the light source connected to the second input terminal and introducing the visible light to the amplification optical fiber or a output optical fiber via the first output terminal; an optical multiplexer/demultiplexer outputting the visible light to the introduction unit, and outputting a leaking return light input from a side of the introduction unit; and a controller outputting the visible light from the output optical fiber in a case of determining a position at which the laser light will be irradiated.
    Type: Grant
    Filed: January 16, 2015
    Date of Patent: November 17, 2015
    Assignee: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Taizo Miyato, Kosuke Kashiwagi, Yoshihiro Emori, Akira Fujisaki, Koji Kajiwara
  • Publication number: 20150214692
    Abstract: An optical fiber laser device includes optical reflectors making an invisible laser light from an amplification optical fiber; a light source outputting a visible light; an introduction unit outputting the laser light input to a first input terminal from a first output terminal mainly, outputting the visible light input to a second input terminal from the first output terminal mainly, inputting the visible light output by the light source connected to the second input terminal and introducing the visible light to the amplification optical fiber or a output optical fiber via the first output terminal; an optical multiplexer/demultiplexer outputting the visible light to the introduction unit, and outputting a leaking return light input from a side of the introduction unit; and a controller outputting the visible light from the output optical fiber in a case of determining a position at which the laser light will be irradiated.
    Type: Application
    Filed: January 16, 2015
    Publication date: July 30, 2015
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Taizo MIYATO, Kosuke Kashiwagi, Yoshihiro Emori, Akira Fujisaki, Koji Kajiwara
  • Patent number: 8811434
    Abstract: A fiber laser apparatus in which pump light is introduced into an optical fiber to generate laser light includes a detecting section that detects signal light leaking out from a core of the optical fiber as leakage signal light, a determining section that determines that, in a case where there is a decrease in an intensity of the leakage signal light detected in the detecting section, a failure of the fiber has occurred, and a stopping section that stops, in a case where the determining section has determined that a failure of the fiber has occurred, the introduction of the pump light into the optical fiber. The detecting section detects the leakage signal light leaking out of a High Reflectivity FBG that is provided on a side opposite to an output side of the laser light.
    Type: Grant
    Filed: May 28, 2013
    Date of Patent: August 19, 2014
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Taizo Miyato, Kosuke Kashiwagi, Yoshihiro Emori, Akira Fujisaki
  • Publication number: 20130299474
    Abstract: A fiber laser apparatus that generates invisible laser light using an amplification optical fiber having a single-mode core and outputs the invisible laser light via an output optical fiber is provided. The fiber laser apparatus includes a visible laser light source that generates visible laser light, an introducing section that introduces the visible laser light generated by the visible laser light source into a core of one of the amplification optical fiber and the output optical fiber, and a drive unit that drives, in a case of performing alignment of an irradiation position of the invisible laser light with respect to a workpiece, the visible laser light source and emits the visible laser light via the core of the output optical fiber.
    Type: Application
    Filed: July 17, 2013
    Publication date: November 14, 2013
    Inventors: Kosuke KASHIWAGI, Akira FUJISAKI, Yoshihiro EMORI
  • Publication number: 20130259069
    Abstract: A fiber laser apparatus in which pump light is introduced into an optical fiber to generate laser light includes a detecting section that detects signal light leaking out from a core of the optical fiber as leakage signal light, a determining section that determines that, in a case where there is a decrease in an intensity of the leakage signal light detected in the detecting section, a failure of the fiber has occurred, and a stopping section that stops, in a case where the determining section has determined that a failure of the fiber has occurred, the introduction of the pump light into the optical fiber. The detecting section detects the leakage signal light leaking out of a High Reflectivity FBG that is provided on a side opposite to an output side of the laser light.
    Type: Application
    Filed: May 28, 2013
    Publication date: October 3, 2013
    Inventors: Taizo Miyato, Kosuke Kashiwagi, Yoshihiro Emori, Akira Fujisaki
  • Patent number: 8437074
    Abstract: A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent central wavelength is greater than 6 nm and smaller than 35 nm. An optical repeater according to the present invention comprises the above-mentioned Raman amplifier and adapted to compensate loss in an optical fiber transmission line by the Raman amplifier. In a Raman amplification method according to the present invention, the shorter the central wavelength of the pumping light the higher light power of said pumping light.
    Type: Grant
    Filed: February 8, 2011
    Date of Patent: May 7, 2013
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Youichi Akasaka, Yoshihiro Emori, Shu Namiki
  • Patent number: 8340482
    Abstract: An optical fiber holding apparatus in accordance with the present invention is characterized in that the same comprises a surface in order to hold an optical fiber which is to be a state of which is rolled up so as not to overlap with each other, wherein at least the surface is formed of a thermo conductive molding body which has a thermal conductivity to be higher than or equal to 0.5 W/mK, and which has an Asker C hardness to be between twenty and fifty. Or, the same comprises a peripheral surface in order to roll up and hold an optical fiber, wherein at least the peripheral surface is formed of a thermo conductive molding body which has the thermal conductivity to be higher than or equal to 0.5 W/mK, and which has the Asker C hardness to be between twenty and fifty. Moreover, it is desirable for the thermo conductive molding body to have a compressive strength of which a peak value is between ten and thirty N/cm2 and a stabilized value is between three and ten N/cm2.
    Type: Grant
    Filed: March 26, 2010
    Date of Patent: December 25, 2012
    Assignee: Furukawa Electric Co., Ltd.
    Inventors: Yoshihiro Arashitani, Toshio Miyahara, Yoshihiro Emori, Masanobu Nakamura
  • Publication number: 20110141553
    Abstract: A Raman amplifier according to the present invention comprises a plurality of pumping means using semiconductor lasers of Fabry-Perot, DFB, or DBR type or MOPAs, and pumping lights outputted from the pumping means have different central wavelengths, and interval between the adjacent central wavelength is greater than 6 nm and smaller than 35 nm. An optical repeater according to the present invention comprises the above-mentioned Raman amplifier and adapted to compensate loss in an optical fiber transmission line by the Raman amplifier. In a Raman amplification method according to the present invention, the shorter the central wavelength of the pumping light the higher light power of said pumping light.
    Type: Application
    Filed: February 8, 2011
    Publication date: June 16, 2011
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Youichi AKASAKA, Yoshihiro EMORI, Shu NAMIKI
  • Patent number: 7936795
    Abstract: The invention provides a cascade Raman laser including a pumping laser light source that generates pumping light, a cascade Raman resonator having an input-side optical reflector that receives the pumping light and selectively reflects light of each wavelength corresponding to a n-th Stokes ray (n is an integer more than 1) of Raman scattering to the pumping light, a Raman optical fiber that is connected to the input-side optical reflector and generates Raman scattering light at least by the pumping light and an output-side optical reflector that is connected to the Raman optical fiber and selectively reflects light of each wavelength corresponding to the n-th Stokes ray and a blocking device interposed between the pumping laser light source and the cascade Raman resonator and blocks the first Stokes ray generated within the cascade Raman resonator from entering the pumping laser light source side.
    Type: Grant
    Filed: November 16, 2009
    Date of Patent: May 3, 2011
    Assignee: The Furukawa Electric Co., Ltd.
    Inventor: Yoshihiro Emori
  • Publication number: 20100265971
    Abstract: The invention provides a cascade Raman laser including a pumping laser light source that generates pumping light, a cascade Raman resonator having an input-side optical reflector that receives the pumping light and selectively reflects light of each wavelength corresponding to a n-th Stokes ray (n is an integer more than 1) of Raman scattering to the pumping light, a Raman optical fiber that is connected to the input-side optical reflector and generates Raman scattering light at least by the pumping light and an output-side optical reflector that is connected to the Raman optical fiber and selectively reflects light of each wavelength corresponding to the n-th Stokes ray and a blocking device interposed between the pumping laser light source and the cascade Raman resonator and blocks the first Stokes ray generated within the cascade Raman resonator from entering the pumping laser light source side.
    Type: Application
    Filed: November 16, 2009
    Publication date: October 21, 2010
    Applicant: THE FURUKAWA ELECTRIC CO., LTD.
    Inventor: Yoshihiro EMORI
  • Publication number: 20100247055
    Abstract: An optical fiber holding apparatus in accordance with the present invention is characterized in that the same comprises a surface in order to hold an optical fiber which is to be a state of which is rolled up so as not to overlap with each other, wherein at least the surface is formed of a thermo conductive molding body which has a thermal conductivity to be higher than or equal to 0.5 W/mK, and which has an Asker C hardness to be between twenty and fifty. Or, the same comprises a peripheral surface in order to roll up and hold an optical fiber, wherein at least the peripheral surface is formed of a thermo conductive molding body which has the thermal conductivity to be higher than or equal to 0.5 W/mK, and which has the Asker C hardness to be between twenty and fifty. Moreover, it is desirable for the thermo conductive molding body to have a compressive strength of which a peak value is between ten and thirty N/cm2 and a stabilized value is between three and ten N/cm2.
    Type: Application
    Filed: March 26, 2010
    Publication date: September 30, 2010
    Applicant: FURUKAWA ELECTRIC CO., LTD.
    Inventors: Yoshihiro ARASHITANI, Toshio Miyahara, Yoshihiro Emori, Masanobu Nakamura
  • Patent number: 7787733
    Abstract: An optical transmission fiber is formed to include a relatively low-index, relatively thin outer cladding layer disposed underneath the protective polymer outer coating. Stray light propagating along an inner cladding layer(s) within the fiber will be refracted into the thin outer cladding (by proper selection of refractive index values). The thin dimension of the outer cladding layer allows for the stray light to “leak” into the outer coating in a controlled, gradual manner so as to minimize heating of the coating associated with the presence of stray light. The inventive fiber may also be bent to assist in the movement of stray light into the coating.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: August 31, 2010
    Assignee: Furukawa Electric North America, Inc.
    Inventors: David John DiGiovanni, Yoshihiro Emori, Michael Fishteyn, Clifford Headley
  • Patent number: 7769298
    Abstract: The present invention provides a pulse train generator comprising: a dual-frequency signal light source for generating a dual-frequency signal; a soliton shaper for soliton-shaping output light from the dual-frequency signal light source; and an adiabatic soliton compressor for performing adiabatic soliton compression on output light from the soliton shaper, and also provides a waveform shaper used in this pulse train generator, including a plurality of highly nonlinear optical transmission lines and a plurality of low-nonlinearity optical transmission lines which has a nonlinearity coefficient lower than that of the plurality of highly nonlinear optical transmission lines and which has a second-order dispersion value of which an absolute value is different from that of the plurality of highly nonlinear optical transmission lines.
    Type: Grant
    Filed: September 25, 2008
    Date of Patent: August 3, 2010
    Assignee: The Furukawa Electric Co., Ltd.
    Inventors: Koji Igarashi, Yoshihiro Emori, Atsushi Oguri, Shu Namiki, Osamu Aso, Masateru Tadakuma
  • Patent number: 7760978
    Abstract: An optical transmission fiber is formed to include a relatively low-index, relatively thin outer cladding layer disposed underneath the protective polymer outer coating. Stray light propagating along an inner cladding layer(s) within the fiber will be refracted into the thin outer cladding (by proper selection of refractive index values). The thin dimension of the outer cladding layer allows for the stray light to “leak” into the outer coating in a controlled, gradual manner so as to minimize heating of the coating associated with the presence of stray light. The inventive fiber may also be bent to assist in the movement of stray light into the coating.
    Type: Grant
    Filed: September 8, 2008
    Date of Patent: July 20, 2010
    Assignee: DFS Fitel LLC
    Inventors: David John DiGiovanni, Yoshihiro Emori, Michael Fishteyn, Clifford Headley