Patents by Inventor Gyu C. Cho
Gyu C. Cho 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: 10256597Abstract: The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.Type: GrantFiled: February 22, 2017Date of Patent: April 9, 2019Assignee: IMRA AMERICA, INC.Inventors: Donald J. Harter, Gyu C. Cho, Zhenlin Liu, Martin E. Fermann, Xinhua Gu, Salvatore F. Nati, Lawrence Shah, Ingmar Hartl, Mark Bendett
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Publication number: 20170179676Abstract: The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.Type: ApplicationFiled: February 22, 2017Publication date: June 22, 2017Applicant: IMRA AMERICA, INC.Inventors: Donald J. HARTER, Gyu C. CHO, Zhenlin LIU, Martin E. FERMANN, Xinhua GU, Salvatore F. NATI, Lawrence SHAH, Ingmar HARTL, Mark BENDETT
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Patent number: 9680280Abstract: An electronic circuit for controlling a laser system consisting of a pulse source and high power fiber amplifier is disclosed. The circuit is used to control the gain of the high power fiber amplifier system so that the amplified output pulses have predetermined pulse energy as the pulse width and repetition rate of the oscillator are varied. This includes keeping the pulse energy constant when the pulse train is turned on. The circuitry is also used to control the temperature of the high power fiber amplifier pump diode such that the wavelength of the pump diode is held at the optimum absorption wavelength of the fiber amplifier as the diode current is varied. The circuitry also provides a means of protecting the high power fiber amplifier from damage due to a loss of signal from the pulse source or from a pulse-source signal of insufficient injection energy.Type: GrantFiled: August 15, 2013Date of Patent: June 13, 2017Assignee: IMRA AMERICA, INC.Inventors: Salvatore F. Nati, Otho E. Ulrich, Jr., Gyu C. Cho, Wayne A. Gillis, Donald J. Harter, Mark Bendett, Ingmar Hartl
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Patent number: 9590386Abstract: The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.Type: GrantFiled: September 10, 2014Date of Patent: March 7, 2017Assignee: IMRA AMERICA, INC.Inventors: Donald J. Harter, Gyu C. Cho, Zhenlin Liu, Martin E. Fermann, Xinhua Gu, Salvatore F. Nati, Lawrence Shah, Ingmar Hartl, Mark Bendett
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Publication number: 20160067822Abstract: Methods, devices, and systems for ultrashort pulse laser processing of optically transparent materials are disclosed, with example applications in scribing, marking, welding, and joining. For example, ultrashort laser pulses create scribe features with one pass of the laser beam across the material, with at least one of the scribe features being formed below the surface of the material. Slightly modifying the ultrashort pulse laser processing conditions produces sub-surface marks. When properly arranged, these marks are clearly visible with correctly aligned illumination. Reflective marks may also be formed with control of laser parameters. A transparent material other than glass may be utilized. A method for welding transparent materials uses ultrashort laser pulses to create a bond through localized heating.Type: ApplicationFiled: August 13, 2015Publication date: March 10, 2016Applicant: IMRA AMERICA, INC.Inventors: Alan Y. ARAI, Gyu C. CHO, Jingzhou XU, Fumiyo YOSHINO, Haibin ZHANG, James BOVATSEK, Makoto YOSHIDA
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Patent number: 9138913Abstract: Methods, devices, and systems for ultrashort pulse laser processing of optically transparent materials are presented, with example applications in scribing, marking, welding, and joining. For example, ultrashort laser pulses create multiple scribe features with one pass of the laser beam across the material, with at least one of the scribe features being formed below the surface of the material. Slightly modifying the ultrashort pulse laser processing conditions produces different types of sub-surface marks. When properly arranged, these marks are clearly visible with correctly aligned illumination through either light scattering or light reflection and nearly invisible without illumination. Transparent material other than glass may be utilized. A method for welding transparent materials uses ultrashort laser pulses to create a bond through localized heating.Type: GrantFiled: March 4, 2009Date of Patent: September 22, 2015Assignee: IMRA AMERICA, INC.Inventors: Alan Y. Arai, Gyu C. Cho, Jingzhou Xu, Fumiyo Yoshino, Haibin Zhang, James Bovatsek, Makoto Yoshida
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Publication number: 20150255942Abstract: By compensating polarization mode-dispersion as well chromatic dispersion in photonic crystal fiber pulse compressors, high pulse energies can be obtained from all-fiber chirped pulse amplification systems. By inducing third-order dispersion in fiber amplifiers via self-phase modulation, the third-order chromatic dispersion from bulk grating pulse compressors can be compensated and the pulse quality of hybrid fiber/bulk chirped pulse amplification systems can be improved. Finally, by amplifying positively chirped pulses in negative dispersion fiber amplifiers, a low noise wavelength tunable seed source via anti-Stokes frequency shifting can be obtained.Type: ApplicationFiled: May 19, 2015Publication date: September 10, 2015Applicant: IMRA AMERICA, INC.Inventors: Martin E. FERMANN, Gennady IMESHEV, Gyu C. CHO, Zhenlin LIU, Donald J. HARTER
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Patent number: 9042004Abstract: By compensating polarization mode-dispersion as well chromatic dispersion in photonic crystal fiber pulse compressors, high pulse energies can be obtained from all-fiber chirped pulse amplification systems. By inducing third-order dispersion in fiber amplifiers via self-phase modulation, the third-order chromatic dispersion from bulk grating pulse compressors can be compensated and the pulse quality of hybrid fiber/bulk chirped pulse amplification systems can be improved. Finally, by amplifying positively chirped pulses in negative dispersion fiber amplifiers, a low noise wavelength tunable seed source via anti-Stokes frequency shifting can be obtained.Type: GrantFiled: July 8, 2013Date of Patent: May 26, 2015Assignee: IMRA AMERICA, INC.Inventors: Martin E. Fermann, Gennady Imeshev, Gyu C. Cho, Zhenlin Liu, Donald J. Harter
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Publication number: 20140376084Abstract: The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.Type: ApplicationFiled: September 10, 2014Publication date: December 25, 2014Applicant: IMRA AMERICA, INC.Inventors: Donald J. HARTER, Gyu C. CHO, Zhenlin LIU, Martin E. FERMANN, Xinhua GU, Salvatore F. NATI, Lawrence SHAH, Ingmar HARTL, Mark BENDETT
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Patent number: 8855151Abstract: The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.Type: GrantFiled: July 5, 2013Date of Patent: October 7, 2014Assignee: Imra America, Inc.Inventors: Donald J. Harter, Gyu C. Cho, Zhenlin Liu, Martin E. Fermann, Xinhua Gu, Salvatore F. Nati, Lawrence Shah, Ingmar Hartl, Mark Bendett
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Patent number: 8773754Abstract: An optimized Yb: doped fiber mode-locked oscillator and fiber amplifier system for seeding Nd: or Yb: doped regenerative amplifiers. The pulses are generated in the Yb: or Nd: doped fiber mode-locked oscillator, and may undergo spectral narrowing or broadening, wavelength converting, temporal pulse compression or stretching, pulse attenuation and/or lowering the repetition rate of the pulse train. The conditioned pulses are subsequently coupled into an Yb: or Nd: fiber amplifier. The amplified pulses are stretched before amplification in the regenerative amplifier that is based on an Nd: or Yb: doped solid-state laser material, and then recompressed for output.Type: GrantFiled: March 22, 2011Date of Patent: July 8, 2014Assignee: IMRA America, Inc.Inventors: Donald J. Harter, Gyu C. Cho, Martin E. Fermann, Ingmar Hartl
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Publication number: 20130329279Abstract: An electronic circuit for controlling a laser system consisting of a pulse source and high power fiber amplifier is disclosed. The circuit is used to control the gain of the high power fiber amplifier system so that the amplified output pulses have predetermined pulse energy as the pulse width and repetition rate of the oscillator are varied. This includes keeping the pulse energy constant when the pulse train is turned on. The circuitry is also used to control the temperature of the high power fiber amplifier pump diode such that the wavelength of the pump diode is held at the optimum absorption wavelength of the fiber amplifier as the diode current is varied. The circuitry also provides a means of protecting the high power fiber amplifier from damage due to a loss of signal from the pulse source or from a pulse-source signal of insufficient injection energy.Type: ApplicationFiled: August 15, 2013Publication date: December 12, 2013Applicant: IMRA AMERICA, INC.Inventors: Salvatore F. NATI, Otho E. ULRICH, JR., Gyu C. CHO, JR., Wayne A. GILLIS, JR., Donald J. HARTER, JR., Mark BENDETT, JR., Ingmar HARTL, JR.
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Publication number: 20130293941Abstract: The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.Type: ApplicationFiled: July 5, 2013Publication date: November 7, 2013Inventors: Donald J. HARTER, Gyu C. CHO, Zhenlin LIU, Martin E. FERMANN, Xinhua GU, Salvatore F. NATI, Lawrence SHAH, Ingmar HARTL, Mark BENDETT
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Publication number: 20130293947Abstract: By compensating polarization mode-dispersion as well chromatic dispersion in photonic crystal fiber pulse compressors, high pulse energies can be obtained from all-fiber chirped pulse amplification systems. By inducing third-order dispersion in fiber amplifiers via self-phase modulation, the third-order chromatic dispersion from bulk grating pulse compressors can be compensated and the pulse quality of hybrid fiber/bulk chirped pulse amplification systems can be improved. Finally, by amplifying positively chirped pulses in negative dispersion fiber amplifiers, a low noise wavelength tunable seed source via anti-Stokes frequency shifting can be obtained.Type: ApplicationFiled: July 8, 2013Publication date: November 7, 2013Inventors: Martin E. Fermann, Gennady Imeshev, Gyu C. Cho, Zhenlin Liu, Donald J. Harter
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Patent number: 8509270Abstract: The invention describes classes of robust fiber laser systems usable as pulse sources for Nd: or Yb: based regenerative amplifiers intended for industrial settings. The invention modifies adapts and incorporates several recent advances in FCPA systems to use as the input source for this new class of regenerative amplifier.Type: GrantFiled: December 21, 2011Date of Patent: August 13, 2013Assignee: IMRA America, Inc.Inventors: Donald J. Harter, Gyu C. Cho, Zhenlin Liu, Martin E. Fermann, Xinhu Gu, Salvatore F. Nati, Lawrence Shah, Ingmar Hartl, Mark Bendett
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Patent number: 8503069Abstract: By compensating polarization mode-dispersion as well chromatic dispersion in photonic crystal fiber pulse compressors, high pulse energies can be obtained from all-fiber chirped pulse amplification systems. By inducing third-order dispersion in fiber amplifiers via self-phase modulation, the third-order chromatic dispersion from bulk grating pulse compressors can be compensated and the pulse quality of hybrid fiber/bulk chirped pulse amplification systems can be improved. Finally, by amplifying positively chirped pulses in negative dispersion fiber amplifiers, low noise wavelength tunable seed source via anti-Stokes frequency shifting can be obtained.Type: GrantFiled: August 5, 2010Date of Patent: August 6, 2013Assignee: IMRA America, Inc.Inventors: Martin E. Fermann, Gennady Imeshev, Gyu C. Cho, Zhenlin Liu, Donald J. Harter
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Patent number: 8228597Abstract: By compensating polarization mode-dispersion as well chromatic dispersion in photonic crystal fiber pulse compressors, high pulse energies can be obtained from all-fiber chirped pulse amplification systems. By inducing third-order dispersion in fiber amplifiers via self-phase modulation, the third-order chromatic dispersion from bulk grating pulse compressors can be compensated and the pulse quality of hybrid fiber/bulk chirped pulse amplification systems can be improved. Finally, by amplifying positively chirped pulses in negative dispersion fiber amplifiers, low noise wavelength tunable seed source via anti-Stokes frequency shifting can be obtained.Type: GrantFiled: July 15, 2008Date of Patent: July 24, 2012Assignee: IMRA America, Inc.Inventors: Martin E. Fermann, Gennady Imeshev, Gyu C. Cho, Zhenlin Liu, Donald J. Harter
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Patent number: 8073036Abstract: A laser head generating ultrashort pulses is integrated with an active beam steering device in the head. Direct linkage with an application system by means of an adequate interface protocol enables the active device to be controlled directly by the application system.Type: GrantFiled: December 13, 2010Date of Patent: December 6, 2011Assignee: Imra America, Inc.Inventors: Gyu C. Cho, Oleg Bouevitch
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Publication number: 20110200061Abstract: An optimized Yb: doped fiber mode-locked oscillator and fiber amplifier system for seeding Nd: or Yb: doped regenerative amplifiers. The pulses are generated in the Yb: or Nd: doped fiber mode-locked oscillator, and may undergo spectral narrowing or broadening, wavelength converting, temporal pulse compression or stretching, pulse attenuation and/or lowering the repetition rate of the pulse train. The conditioned pulses are subsequently coupled into an Yb: or Nd: fiber amplifier. The amplified pulses are stretched before amplification in the regenerative amplifier that is based on an Nd: or Yb: doped solid-state laser material, and then recompressed for output.Type: ApplicationFiled: March 22, 2011Publication date: August 18, 2011Applicant: IMRA AMERICA, INC.Inventors: Donald J. HARTER, Gyu C. CHO, Martin E. FERMANN, Ingmar HARTL
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Publication number: 20110103408Abstract: A laser head generating ultrashort pulses is integrated with an active beam steering device in the head. Direct linkage with an application system by means of an adequate interface protocol enables the active device to be controlled directly by the application system.Type: ApplicationFiled: December 13, 2010Publication date: May 5, 2011Applicant: IMRA AMERICA, INC.Inventors: Gyu C. CHO, Oleg BOUEVITCH