Patents by Inventor Dmitri Simanovski
Dmitri Simanovski 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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Publication number: 20230029200Abstract: An actively cooled end-pumped solid-state laser gain device includes a bulk solid-state gain medium. An input-end of the gain medium receives a pump laser beam incident thereon and propagating in the direction toward an opposite output-end. The metal foil is disposed over a face of the gain medium extending between the input- and output-ends. A housing cooperates with the metal foil to form a coolant channel on the face the gain medium. The coolant channel has an inlet and an outlet configured to conduct a flow of coolant along the metal foil from the input-end towards the output-end. The metal foil is secured between the gain medium and portions of the housing running adjacent to the coolant channel. The metal foil provides a reliable thermal contact and imparts little or no stress on the bulk gain medium.Type: ApplicationFiled: June 29, 2022Publication date: January 26, 2023Applicant: Coherent, Inc.Inventors: Qize SHU, Dmitri SIMANOVSKI
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Patent number: 11404841Abstract: An optical parametric chirped-pulse amplifier includes first and second optical parametric amplifier stages that successively amplify a stretched signal beam. A pulsed laser provides a fundamental beam. The second amplifier stage is pumped by the full power of a second-harmonic beam that is generated from the fundamental beam. A residual fundamental beam is used to generate another second-harmonic beam that pumps the first amplifier stage.Type: GrantFiled: August 20, 2019Date of Patent: August 2, 2022Assignee: Coherent, Inc.Inventors: Dmitri Simanovski, Norman Hodgson
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Patent number: 11152757Abstract: A fiber laser producing a beam of ultrashort laser pulses at a repetition rate greater than 200 MHz includes a linear fiber resonator and a fiber branch. Ultrashort laser pulses are generated by passive mode-locking and circulate within the linear fiber resonator. Each circulating laser pulse is split into a portion that continues propagating in the linear fiber resonator and a complementary portion that propagates through the fiber branch and is then returned to the linear fiber resonator. The optical length of the linear fiber resonator is an integer multiple of the optical length of the fiber branch. The repetition rate of the ultrashort laser pulses is the reciprocal of the propagation time of the laser pulses through the fiber branch.Type: GrantFiled: June 6, 2019Date of Patent: October 19, 2021Assignee: Coherent, Inc.Inventors: Norman Hodgson, Dmitri Simanovski
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Publication number: 20210057868Abstract: An optical parametric chirped-pulse amplifier includes first and second optical parametric amplifier stages that successively amplify a stretched signal beam. A pulsed laser provides a fundamental beam. The second amplifier stage is pumped by the full power of a second-harmonic beam that is generated from the fundamental beam. A residual fundamental beam is used to generate another second-harmonic beam that pumps the first amplifier stage.Type: ApplicationFiled: August 20, 2019Publication date: February 25, 2021Applicant: Coherent, Inc.Inventors: Dmitri SIMANOVSKI, Norman HODGSON
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Publication number: 20200388983Abstract: A fiber laser producing a beam of ultrashort laser pulses at a repetition rate greater than 200 MHz includes a linear fiber resonator and a fiber branch. Ultrashort laser pulses are generated by passive mode-locking and circulate within the linear fiber resonator. Each circulating laser pulse is split into a portion that continues propagating in the linear fiber resonator and a complementary portion that propagates through the fiber branch and is then returned to the linear fiber resonator. The optical length of the linear fiber resonator is an integer multiple of the optical length of the fiber branch. The repetition rate of the ultrashort laser pulses is the reciprocal of the propagation time of the laser pulses through the fiber branch.Type: ApplicationFiled: June 6, 2019Publication date: December 10, 2020Applicant: Coherent, Inc.Inventors: Norman HODGSON, Dmitri SIMANOVSKI
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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: 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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Patent number: 9684125Abstract: Plane-polarized laser-radiation from a laser-source is converted to circularly polarized radiation by a quarter-wave plate. The circularly polarized radiation is input into a hollow-core fiber for transport to a point of use. The transported radiation is converted back to plane-polarized radiation by another quarter-wave plate between the fiber and the point of use.Type: GrantFiled: April 13, 2016Date of Patent: June 20, 2017Assignee: Coherent, Inc.Inventors: Michael Hertwig, Norman Hodgson, Dmitri Simanovski
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Patent number: 9653867Abstract: A source of femtosecond pulses at center wavelengths of about 940 nm and about 1140 nanometers (nm) includes a mode-locked fiber MOPA delivering pulses having a center wavelength of about 1040 nm. The 1040-nanometer pulses are spectrally spread into a continuum spectrum extending in range between about 900 nm and about 1200 nm and having well defined side-lobes around the 940-nm and 1140-wavelengths. Radiation is spatially selected from these side-lobes and delivered as the 940-nm and 1140-nm pulses.Type: GrantFiled: April 4, 2014Date of Patent: May 16, 2017Assignee: Coherent, Inc.Inventors: Dmitri Simanovski, Norman Hodgson
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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: 20160334570Abstract: Plane-polarized laser-radiation from a laser-source is converted to circularly polarized radiation by a quarter-wave plate. The circularly polarized radiation is input into a hollow-core fiber for transport to a point of use. The transported radiation is converted back to plane-polarized radiation by another quarter-wave plate between the fiber and the point of use.Type: ApplicationFiled: April 13, 2016Publication date: November 17, 2016Inventors: Michael HERTWIG, Norman HODGSON, Dmitri SIMANOVSKI
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Publication number: 20160294145Abstract: A source of femtosecond pulses at center wavelengths of about 940 nm and about 1140 nanometers (nm) includes a mode-locked fiber MOPA delivering pulses having a center wavelength of about 1040 nm. The 1040-nanometer pulses are spectrally spread into a continuum spectrum extending in range between about 900 nm and about 1200 nm and having well defined side-lobes around the 940-nm and 1140-wavelengths. Radiation is spatially selected from these side-lobes and delivered as the 940-nm and 1140-nm pulses.Type: ApplicationFiled: April 4, 2014Publication date: October 6, 2016Applicant: COHERENT, INC.Inventors: Dmitri SIMANOVSKI, Norman HODGSON
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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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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: 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