Patents by Inventor Andrei Starodoumov
Andrei Starodoumov 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: 10642127Abstract: An apparatus for generating visible light including a laser source emitting a fundamental beam, an optically nonlinear crystal, and a seed source emitting a seed beam. The optically nonlinear crystal receives the fundamental beam. The fundamental beam propagates in the nonlinear crystal at a first phase-matching angle for second-harmonic generation. A portion of the fundamental beam is converted into a second-harmonic beam that propagates in the nonlinear crystal at the first phase-matching angle for optical parametric generation. The seed source emits a seed beam having a wavelength longer than the second-harmonic beam. The seed beam is directed into the nonlinear crystal and propagates at a second phase-matching angle for the optical parametric amplification. A portion of the second-harmonic beam is converted into a signal beam at the seed wavelength and an idler beam by the optical parametric amplification.Type: GrantFiled: May 9, 2019Date of Patent: May 5, 2020Assignee: Coherent, Inc.Inventors: Dmitri Simanovski, Andrei Starodoumov, Norman Hodgson
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Patent number: 10535975Abstract: Laser-apparatus includes a fiber-MOPA arranged to deliver amplified seed optical pulses having a wavelength of about 1043 nanometers to a multi-pass ytterbium-doped yttrium aluminum garnet solid-state optical amplifier for further amplification.Type: GrantFiled: August 31, 2017Date of Patent: January 14, 2020Assignee: Coherent, Inc.Inventors: Andrei Starodoumov, Norman Hodgson
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Publication number: 20190067897Abstract: Laser-apparatus includes a fiber-MOPA arranged to deliver amplified seed optical pulses having a wavelength of about 1043 nanometers to a multi-pass ytterbium-doped yttrium aluminum garnet solid-state optical amplifier for further amplification.Type: ApplicationFiled: August 31, 2017Publication date: February 28, 2019Inventors: Andrei STARODOUMOV, Norman HODGSON
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Patent number: 9941654Abstract: An apparatus for generating and amplifying laser beams at approximately 1 micrometer wavelength is disclosed. The apparatus includes an ytterbium-doped gain-crystal pumped by an ytterbium fiber-laser. The fiber-laser enables a pump wavelength to be selected that minimizes heating of the gain-crystal. The apparatus can be configured for generating and amplifying ultra-fast pulses, utilizing the gain-bandwidth of ytterbium-doped gain-crystals.Type: GrantFiled: September 1, 2015Date of Patent: April 10, 2018Assignee: Coherent, Inc.Inventors: Andrei Starodoumov, Dmitri Simanovski
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Publication number: 20170063018Abstract: An apparatus for generating and amplifying laser beams at approximately 1 micrometer wavelength is disclosed. The apparatus includes an ytterbium-doped gain-crystal pumped by an ytterbium fiber-laser. The fiber-laser enables a pump wavelength to be selected that minimizes heating of the gain-crystal. The apparatus can be configured for generating and amplifying ultra-fast pulses, utilizing the gain-bandwidth of ytterbium-doped gain-crystals.Type: ApplicationFiled: September 1, 2015Publication date: March 2, 2017Inventors: Andrei STARODOUMOV, Dmitri SIMANOVSKI
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Patent number: 9515445Abstract: A mode-locked fiber MOPA delivers pulses of laser-radiation. A super-continuum generator including a bulk spectral-broadening element and a negative group-delay dispersion (NGDD) device is arranged to receive a pulse from the MOPA and cause the pulse to make a predetermined number of sequential interactions with the broadening element and the NGDD device. After making the predetermined interactions, the pulse is delivered from the super-continuum generator with a very broad spectral-bandwidth and a very short duration.Type: GrantFiled: December 3, 2015Date of Patent: December 6, 2016Assignee: Coherent, Inc.Inventors: Norman Hodgson, Dmitri Simanovski, Andrei Starodoumov
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Publication number: 20160087390Abstract: A mode-locked fiber MOPA delivers pulses of laser-radiation. A super-continuum generator including a bulk spectral-broadening element and a negative group-delay dispersion (NGDD) device is arranged to receive a pulse from the MOPA and cause the pulse to make a predetermined number of sequential interactions with the broadening element and the NGDD device. After making the predetermined interactions, the pulse is delivered from the super-continuum generator with a very broad spectral-bandwidth and a very short duration.Type: ApplicationFiled: December 3, 2015Publication date: March 24, 2016Inventors: Norman HODGSON, Dmitri SIMANOVSKI, Andrei STARODOUMOV
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Patent number: 9240663Abstract: A mode-locked fiber MOPA delivers pulses of laser-radiation. A super-continuum generator including a bulk spectral-broadening element and a negative group-delay dispersion (NGDD) device is arranged to receive a pulse from the MOPA and cause the pulse to make a predetermined number of sequential interactions with the broadening element and the NGDD device. After making the predetermined interactions, the pulse is delivered from the super-continuum generator with a very broad spectral-bandwidth and a very short duration.Type: GrantFiled: November 14, 2013Date of Patent: January 19, 2016Assignee: Coherent, Inc.Inventors: Norman Hodgson, Dmitri Simanovski, Andrei Starodoumov
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Patent number: 9188833Abstract: Pulses from a mode-locked Yb-doped laser (12) are spectrally broadened in an optical fiber (28), and temporally compressed in a grating compressor (32), then frequency-doubled (34) and used to pump an optical parametric oscillator (OPO) (40). The OPO output is tunable over a wavelength range from about 600 nm to about 1100 nm. Mode-locking in the Yb-doped laser (12) is accomplished with a SESAM (14) or by Kerr-lens mode-locking with a Kerr medium (82) and a hard aperture (84).Type: GrantFiled: February 1, 2012Date of Patent: November 17, 2015Assignee: Coherent, Inc.Inventors: Norman Hodgson, Dmitri Simanovski, Andrei Starodoumov
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Patent number: 9059564Abstract: A mode-locked fiber laser has a resonator including a gain-fiber, a mode-locking element, and a spectrally-selective dispersion compensating device. The resonator can be a standing-wave resonator or a traveling-wave resonator. The dispersion compensating device includes only one diffraction grating combined with a lens and a mirror to provide a spatial spectral spread. The numerical aperture of the gain-fiber selects which portion of the spectral spread can oscillate in the resonator.Type: GrantFiled: January 24, 2014Date of Patent: June 16, 2015Assignee: Coherent, Inc.Inventors: Dmitri Simanovski, Andrei Starodoumov
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Publication number: 20150131143Abstract: A mode-locked fiber MOPA delivers pulses of laser-radiation. A super-continuum generator including a bulk spectral-broadening element and a negative group-delay dispersion (NGDD) device is arranged to receive a pulse from the MOPA and cause the pulse to make a predetermined number of sequential interactions with the broadening element and the NGDD device. After making the predetermined interactions, the pulse is delivered from the super-continuum generator with a very broad spectral-bandwidth and a very short duration.Type: ApplicationFiled: November 14, 2013Publication date: May 14, 2015Applicant: COHERENT, INC.Inventors: Norman HODGSON, Dmitri SIMANOVSKI, Andrei STARODOUMOV
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Patent number: 8873136Abstract: An optical amplifier for use as a final amplification stage for a fiber-MOPA has a gain-element including a thin wafer or chip of ytterbium-doped YAG. An elongated gain-region is formed in gain-element by multiple incidences of radiation from a diode-laser bar.Type: GrantFiled: January 30, 2013Date of Patent: October 28, 2014Assignee: Coherent, Inc.Inventors: Andrei Starodoumov, Norman Hodgson
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Publication number: 20140211301Abstract: An optical amplifier for use as a final amplification stage for a fiber-MOPA has a gain-element including a thin wafer or chip of ytterbium-doped YAG. An elongated gain-region is formed in gain-element by multiple incidences of radiation from a diode-laser bar.Type: ApplicationFiled: January 30, 2013Publication date: July 31, 2014Applicant: COHERENT, INC.Inventors: Andrei STARODOUMOV, Norman HODGSON
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Publication number: 20140204964Abstract: A mode-locked fiber laser has a resonator including a gain-fiber, a mode-locking element, and a spectrally-selective dispersion compensating device. The resonator can be a standing-wave resonator or a traveling-wave resonator. The dispersion compensating device includes only one diffraction grating combined with a lens and a mirror to provide a spatial spectral spread. The numerical aperture of the gain-fiber selects which portion of the spectral spread can oscillate in the resonator.Type: ApplicationFiled: January 24, 2014Publication date: July 24, 2014Applicant: Coherent, Inc.Inventors: Dmitri SIMANOVSKI, Andrei STARODOUMOV
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Patent number: 8717670Abstract: A fiber-MOPA includes a seed-pulse source followed by fiber amplifier stages. The seed pulse source delivers signal pulses for performing a laser operation and delivers radiation between the seed pulses to maintain the collective average of the seed pulse power and intermediate radiation power constant. Keeping this average power constant keeps the instantaneous available gain of the fiber amplifier stages constant. This provides that the seed pulse delivery can be changed from one regime to a next without a period of instability between the regimes.Type: GrantFiled: June 17, 2011Date of Patent: May 6, 2014Assignee: Coherent, Inc.Inventors: Andrei Starodoumov, Ronald Lambert, Michael Snadden, Andreas Diening
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Patent number: 8675709Abstract: A hybrid CW MOPA includes an OPS-laser resonator delivering radiation in a plurality of longitudinal lasing-modes or wavelengths. The multiple longitudinal mode output is amplified in a fiber-amplifier. Amplified lasing-modes from the fiber-amplifier are frequency-converted by an optically nonlinear crystal in a ring-resonator having the same length as the laser resonator, such that the ring-resonator is resonant for all of the amplified lasing-modes.Type: GrantFiled: December 10, 2012Date of Patent: March 18, 2014Assignee: Coherent, Inc.Inventors: Sergei Govorkov, Andrei Starodoumov, Arnaud Lepert
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Patent number: 8654799Abstract: A mode-locked fiber laser has a resonator including a gain-fiber, a mode-locking element, and a spectrally-selective dispersion compensating device. The resonator can be a standing-wave resonator or a traveling-wave resonator. The dispersion compensating device includes only one diffraction grating combined with a lens and a minor to provide a spatial spectral spread. The numerical aperture of the gain-fiber selects which portion of the spectral spread can oscillate in the resonator.Type: GrantFiled: December 14, 2010Date of Patent: February 18, 2014Assignee: Coherent, Inc.Inventors: Dmitri Simanovski, Andrei Starodoumov
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Publication number: 20140009821Abstract: Pulses from a mode-locked Yb-doped laser (12) are spectrally broadened in an optical fiber (28), and temporally compressed in a grating compressor (32), then frequency-doubled (34) and used to pump an optical parametric oscillator (OPO) (40). The OPO output is tunable over a wavelength range from about 600 nm to about 1100 nm. Mode-locking in the Yb-doped laser (12) is accomplished with a SESAM (14) or by Kerr-lens mode-locking with a Kerr medium (82) and a hard aperture (84).Type: ApplicationFiled: February 1, 2012Publication date: January 9, 2014Applicant: Coherent, Inc.Inventors: Norman Hodgson, Dmitri Simanovski, Andrei Starodoumov
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Patent number: 8582611Abstract: In a frequency-tripled fiber-MOPA, a pre-amplified plane-polarized seed-pulse having a fundamental frequency is divided into two pulse-components, plane-polarized in polarization-orientations at 90-degrees to each other. The fundamental-wavelength pulse-components are amplified in a common amplifier-fiber. The amplified components are separately propagated on different optical paths. One of the amplified components is frequency-doubled. The frequency-doubled component on one path and fundamental-frequency component on the other path are then combined on a common-path and sum-frequency mixed to provide a frequency-tripled pulse.Type: GrantFiled: January 20, 2012Date of Patent: November 12, 2013Assignee: Coherent, Inc.Inventor: Andrei Starodoumov
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Publication number: 20130188658Abstract: In a frequency-tripled fiber-MOPA, a pre-amplified plane-polarized seed-pulse having a fundamental frequency is divided into two pulse-components, plane-polarized in polarization-orientations at 90-degrees to each other. The fundamental-wavelength pulse-components are amplified in a common amplifier-fiber. The amplified components are separately propagated on different optical paths. One of the amplified components is frequency-doubled. The frequency-doubled component on one path and fundamental-frequency component on the other path are then combined on a common-path and sum-frequency mixed to provide a frequency-tripled pulse.Type: ApplicationFiled: January 20, 2012Publication date: July 25, 2013Applicant: Coherent, Inc.Inventor: Andrei STARODOUMOV