Patents by Inventor Sergei V. Govorkov
Sergei V. Govorkov 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: 20220026615Abstract: A source of high-radiance broad-band incoherent light includes an optical waveguide, having a core made of phosphor granules embedded in a matrix of glass and a cladding. The core having a relatively high refractive index and the cladding having a relatively low refractive index. The phosphor granules and the glass matrix having about the same refractive index. Radiation from one or more diode-lasers is injected into one end of the waveguide to energize the phosphor granules, producing broad-band incoherent light, which is confined and guided to an opposite end of the waveguide as output light.Type: ApplicationFiled: December 10, 2019Publication date: January 27, 2022Applicant: Coherent, Inc.Inventors: Sergei V. GOVORKOV, John H. JERMAN
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Patent number: 9083140Abstract: A CW fiber-laser includes a gain fiber having a reflector proximity-coupled to one end, with the other end left uncoated. A laser resonator is defined by the reflector and the uncoated end of the gain-fiber. Pump-radiation from two fast-axis diode-laser bar stacks is combined and focused into the uncoated end of the gain-fiber for energizing the fiber. Laser radiation resulting from the energizing is delivered from the uncoated end of the gain-fiber and separated from the pump-radiation by a dichroic mirror.Type: GrantFiled: March 29, 2011Date of Patent: July 14, 2015Assignee: Coherent, Inc.Inventors: John D. Minelly, Sergei V. Govorkov, Luis A. Spinelli, Douglas Anthon, Jay Michael Ingalls
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Patent number: 9014220Abstract: A CW ytterbium-doped fiber-laser includes a gain-fiber having a reflector proximity-coupled to one end, with the other end left uncoated. A laser resonator is defined by the reflector and the uncoated end of the gain-fiber. Pump-radiation from fast-axis diode-laser bar-stacks emitting at 915 nm and 976 nm is combined and focused into the uncoated end of the gain-fiber for energizing the fiber. Laser radiation resulting from the energizing is delivered from the uncoated end of the gain-fiber and separated from the pump-radiation by a dichroic mirror.Type: GrantFiled: October 2, 2012Date of Patent: April 21, 2015Assignee: Coherent, Inc.Inventors: John D. Minelly, Sergei V. Govorkov, Luis A. Spinelli, Douglas William Anthon, Jay Michael Ingalls
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Patent number: 8354611Abstract: In laser engraving apparatus for engraving a gray-scale image on a plastic ID-card, the laser is a modulatable optically pumped semiconductor laser. Focusing optics focus a beam from the laser into a focal spot about 10 micrometers in diameter. The ID-card is mounted on a turntable which is rotated such that the focal spot sweeps over the ID card. The turntable is translated in a direction transverse to the rotation direction and the laser is modulated such that the engraved gray-scale image is formed by a matrix of parallel black lines of various length and spacing.Type: GrantFiled: September 1, 2009Date of Patent: January 15, 2013Assignee: Coherent, Inc.Inventors: Sergei V. Govorkov, Luis A. Spinelli
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Publication number: 20120230352Abstract: A CW fiber-laser includes a gain fiber having a reflector proximity-coupled to one end, with the other end left uncoated. A laser resonator is defined by the reflector and the uncoated end of the gain-fiber. Pump-radiation from two fast-axis diode-laser bar stacks is combined and focused into the uncoated end of the gain-fiber for energizing the fiber. Laser radiation resulting from the energizing is delivered from the uncoated end of the gain-fiber and separated from the pump-radiation by a dichroic minor.Type: ApplicationFiled: March 29, 2011Publication date: September 13, 2012Applicant: Coherent, Inc.Inventors: John D. Minelly, Sergei V. Govorkov, Luis A. Spinelli, Douglas William Anthon, Jay Michael Ingalls
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Patent number: 8265117Abstract: Laser systems have a line-narrowed master oscillator and a power oscillator for amplifying the output of the master oscillator. The power oscillator includes optical arrangements for limiting the bandwidth of radiation that can be amplified. The limited amplification bandwidth of the power oscillator is relatively broad compared to that of the output of the master oscillator, but narrower than would be the case without the bandwidth limiting arrangements. The bandwidth narrowing arrangements of the power oscillator function primarily to restrict the bandwidth of amplified spontaneous emission generated by the power oscillator.Type: GrantFiled: June 11, 2010Date of Patent: September 11, 2012Assignee: Coherent GmbHInventors: Sergei V. Govorkov, Alexander O. W. Weissner, Timur V. Misyuryaev, Alexander Jacobson, Gongxue Hua, Rainer Paetzel, Thomas Schroeder, Hans-Stephen Albrecht
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Patent number: 8170073Abstract: A semiconductor gain-structure functions as a gain-element in a laser-resonator. The gain-structure is bonded to a diamond heat-spreader that is peripherally cooled by a heat-sink configured to allow access to the gain-structure by laser-radiation circulating in the laser-resonator. In one example, the gain-structure is used as a transmissive gain-structure in a traveling-wave ring-resonator. In another example, the gain-structure surmounts mirror-structure which functions as an end-mirror of a standing-wave laser-resonator.Type: GrantFiled: September 11, 2009Date of Patent: May 1, 2012Assignee: Coherent, Inc.Inventors: Sergei V. Govorkov, R. Russel Austin
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Publication number: 20110164104Abstract: Apparatus for marking a bitmap image on tape includes a source of a modulatable laser-beam. The beam is directed to an oscillating mirror on a carriage translatable across the width direction of the tape. The oscillating mirror directs the beam to a focusing lens mounted on the carriage. The focusing lens is arranged to focus the beam to a focal-spot on the tape. As the carriage is translated, the focal-spot is swept reciprocally in a wave-like path across the tape. Modulation of the beam is arranged such that pixels of a plurality of rows of the bitmap image are printed in one traverse of the carriage. The tape is advanced incrementally and repeated traverses of the carriage are made to complete printing of the bitmap image.Type: ApplicationFiled: March 17, 2011Publication date: July 7, 2011Applicant: Coherent, Inc.Inventors: Sergei V. GOVORKOV, John H. Jerman
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Patent number: 7952603Abstract: Apparatus for marking a bitmap image on tape includes a source of a modulatable laser-beam. The beam is directed to an oscillating mirror on a carriage translatable across the width direction of the tape. The oscillating mirror directs the beam to a focusing lens mounted on the carriage. The focusing lens is arranged to focus the beam to a focal-spot on the tape. As the carriage is translated, the focal-spot is swept reciprocally in a wave-like path across the tape. Modulation of the beam is arranged such that pixels of a plurality of rows of the bitmap image are printed in one traverse of the carriage. The tape is advanced incrementally and repeated traverses of the carriage are made to complete printing of the bitmap image.Type: GrantFiled: September 29, 2008Date of Patent: May 31, 2011Assignee: Coherent, Inc.Inventors: Sergei V. Govorkov, John H. Jerman
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Patent number: 7952602Abstract: Apparatus for laser-marking on tape includes a laser arranged to emit a modulated beam of laser-radiation. Projection-optics are arranged to focus a beam to a spot on the tape. The tape is driven under the focal spot for scanning the beam in the length direction of the tape. The projection-optics are rotated reciprocally to scan the focal spot over the tape in a direction transverse to the length direction of the tape.Type: GrantFiled: September 18, 2008Date of Patent: May 31, 2011Assignee: Coherent, Inc.Inventors: Sergei V. Govorkov, John H. Jerman
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Publication number: 20110064099Abstract: A semiconductor gain-structure functions as a gain-element in a laser-resonator. The gain-structure is bonded to a diamond heat-spreader that is peripherally cooled by a heat-sink configured to allow access to the gain-structure by laser-radiation circulating in the laser-resonator. In one example, the gain-structure is used as a transmissive gain-structure in a traveling-wave ring-resonator. In another example, the gain-structure surmounts a mirror-structure which functions as an end-mirror of a standing-wave laser-resonator.Type: ApplicationFiled: September 11, 2009Publication date: March 17, 2011Applicant: COHERENT, INC.Inventors: Sergei V. Govorkov, R. Russel Austin
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Publication number: 20100309945Abstract: Laser systems have a line-narrowed master oscillator and a power oscillator for amplifying the output of the master oscillator. The power oscillator includes optical arrangements for limiting the bandwidth of radiation that can be amplified. The limited amplification bandwidth of the power oscillator is relatively broad compared to that of the output of the master oscillator, but narrower than would be the case without the bandwidth limiting arrangements. The bandwidth narrowing arrangements of the power oscillator function primarily to restrict the bandwidth of amplified spontaneous emission generated by the power oscillator.Type: ApplicationFiled: June 11, 2010Publication date: December 9, 2010Applicant: Coherent, Inc.Inventors: Sergei V. GOVORKOV, Alexander O.W. Weissner, Timur V. Misyuryaev, Alexander Jacobson, Gongxue Hua, Rainer Paetzel, Thomas Schroeder, Hans-Stephen Albrecht
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Publication number: 20100260210Abstract: An optical gain-fiber of a fiber-laser or a fiber-amplifier is optically pumped by radiation from a plurality of external cavity, optically pumped, surface-emitting semiconductor lasers (OPS-lasers). In one example, radiation from the OPS-lasers is focused by a lens into cladding of the gain-fiber at one end of the fiber. In another example radiation from the diode-lasers is focused into the core of a delivery fiber at one end of the delivery fiber. The other end of the delivery fiber is coupled to the cladding of the gain-fiber.Type: ApplicationFiled: April 13, 2009Publication date: October 14, 2010Applicant: Coherent, Inc.Inventors: Luis A. SPINELLI, Sergei V. Govorkov, Andrea Caprara
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Patent number: 7760788Abstract: Laser systems have a line-narrowed master oscillator and a power oscillator for amplifying the output of the master oscillator. The power oscillator includes optical arrangements for limiting the bandwidth of radiation that can be amplified. The limited amplification bandwidth of the power oscillator is relatively broad compared to that of the output of the master oscillator, but narrower than would be the case without the bandwidth limiting arrangements. The bandwidth narrowing arrangements of the power oscillator function primarily to restrict the bandwidth of amplified spontaneous emission generated by the power oscillator.Type: GrantFiled: July 9, 2008Date of Patent: July 20, 2010Assignee: Coherent, Inc.Inventors: Sergei V. Govorkov, Alexander O. W. Wiessner, Timur V. Misyuryaev, Alexander Jacobson, Gongxue Hua, Rainer Paetzel, Thomas Schroeder, Hans-Stephan Albrecht
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Patent number: 7738515Abstract: Laser apparatus is disclosed in which fundamental-wavelength optical pulses delivered from a mode-locked laser resonator at a pulse-repetition frequency (PRF) are converted to harmonic-wavelength pulses in an optical delay loop. One example is disclosed in which the harmonic-wavelength pulses are delivered directly from the delay loop. Another example is disclosed in which the harmonic-wavelength pulses are divided by the delay loop into a number of temporally spaced-apart replicas thereof, and the delay loop delivers bursts of replicas of different one of the harmonic wavelength pulses at a burst-repetition frequency equal to or a multiple of the PRF of the resonator.Type: GrantFiled: June 12, 2008Date of Patent: June 15, 2010Assignee: Coherent, Inc.Inventors: Luis A. Spinelli, Sergei V. Govorkov, R. Russel Austin
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Patent number: 7724785Abstract: Multiple laser resonators share a common acousto-optic Q-switch. The Q-switch is driven by a radio-frequency (RF) transducer that causes an acoustic wave to propagate in the Q-switch. Turning off the RF transducer discontinues propagation of the acoustic wave and causes each of the laser resonators to deliver an optical pulse. The finite velocity of the acoustic wave causes the pulses to be delivered temporally spaced apart.Type: GrantFiled: June 29, 2007Date of Patent: May 25, 2010Assignee: Coherent, Inc.Inventors: Luis A. Spinelli, Sergei V. Govorkov
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Publication number: 20100102043Abstract: In laser engraving apparatus for engraving a gray-scale image on a plastic ID-card, the laser is a modulatable optically pumped semiconductor laser. Focusing optics focus a beam from the laser into a focal spot about 10 micrometers in diameter. The ID-card is mounted on a turntable which is rotated such that the focal spot sweeps over the ID card. The turntable is translated in a direction transverse to the rotation direction and the laser is modulated such that the engraved gray-scale image is formed by a matrix of parallel black lines of various length and spacing.Type: ApplicationFiled: September 1, 2009Publication date: April 29, 2010Applicant: Coherent, Inc.Inventors: Sergei V. GOVORKOV, Luis A. Spinelli
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Patent number: 7697207Abstract: Arrangements for combination and fast-axis alignment of fast-axes of diode-laser beams are disclosed. Alignment arrangements include providing each diode-laser with a corresponding alignable fast-axis collimating lens, providing individually alignable mirrors for steering an re-orienting beams from each diode-laser, and providing single diode-laser slab-modules in which the diode-laser beams can be pre-aligned to a common propagation-axis direction, and in which edges and surfaces of the slabs can be used to align the fast and slow-axes of the beams. Beam combination methods include combination by dichroic elements, polarization-sensitive elements, and optical fiber bundles.Type: GrantFiled: February 4, 2009Date of Patent: April 13, 2010Assignee: Coherent, Inc.Inventors: Sergei V. Govorkov, Sol Peter DiJaili, Douglas William Anthon, Luis A. Spinelli
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Publication number: 20100078857Abstract: Apparatus for marking a bitmap image on tape includes a source of a modulatable laser-beam. The beam is directed to an oscillating mirror on a carriage translatable across the width direction of the tape. The oscillating mirror directs the beam to a focusing lens mounted on the carriage. The focusing lens is arranged to focus the beam to a focal-spot on the tape. As the carriage is translated, the focal-spot is swept reciprocally in a wave-like path across the tape. Modulation of the beam is arranged such that pixels of a plurality of rows of the bitmap image are printed in one traverse of the carriage. The tape is advanced incrementally and repeated traverses of the carriage are made to complete printing of the bitmap image. Light from the laser can be delivered to the oscillating mirror via an optical fiber.Type: ApplicationFiled: August 12, 2009Publication date: April 1, 2010Applicant: Coherent, Inc.Inventors: Sergei V. Govorkov, John H. Jerman
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Publication number: 20100079572Abstract: Apparatus for marking a bitmap image on tape includes a source of a modulatable laser-beam. The beam is directed to an oscillating mirror on a carriage translatable across the width direction of the tape. The oscillating mirror directs the beam to a focusing lens mounted on the carriage. The focusing lens is arranged to focus the beam to a focal-spot on the tape. As the carriage is translated, the focal-spot is swept reciprocally in a wave-like path across the tape. Modulation of the beam is arranged such that pixels of a plurality of rows of the bitmap image are printed in one traverse of the carriage. The tape is advanced incrementally and repeated traverses of the carriage are made to complete printing of the bitmap image.Type: ApplicationFiled: September 29, 2008Publication date: April 1, 2010Inventors: Sergei V. Govorkov, John H. Jerman