Patents Assigned to Coherent, Inc.
  • Stackable electrically-isolated diode-laser bar assembly
    Patent number: 9941658
    Abstract: A diode-laser bar assembly comprises a diode-laser bar mounted onto a cooler by way of an electrically-insulating submount. A laminated connector is provided that includes two electrically-conducting sheets bonded to opposite sides on an electrically-insulating sheet. An electrical insulator is located between the laminated connector and the cooler. One electrically-conducting sheet is connected to n-side of the diode-laser bar and the other electrically-conducting sheet is connected to p-side of the diode-laser bar.
    Type: Grant
    Filed: April 26, 2017
    Date of Patent: April 10, 2018
    Assignee: Coherent, Inc.
    Inventors: Xiaoping Liang, Fei Zhou
  • Fiber-laser pumped crystal-laser
    Patent number: 9941654
    Abstract: 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: Grant
    Filed: September 1, 2015
    Date of Patent: April 10, 2018
    Assignee: Coherent, Inc.
    Inventors: Andrei Starodoumov, Dmitri Simanovski
  • Carbon monoxide laser machining system
    Patent number: 9925620
    Abstract: Laser-machining apparatus includes a carbon monoxide (CO) laser emitting a beam of laser-radiation having forty-four different wavelength components and optical elements for delivering the radiation to workpiece. An acousto-optic modulator is provided for modulating the beam on the workpiece. A birefringent plate is provided in the beam transported to the workpiece for randomly polarizing radiation incident on the workpiece. A minimum distance of the workpiece from the laser, and the number of different-wavelength components in the laser beam provides that no optical isolator is required for preventing feedback of radiation into the laser.
    Type: Grant
    Filed: August 19, 2015
    Date of Patent: March 27, 2018
    Assignee: Coherent, Inc.
    Inventors: Eric R. Mueller, Michael Alexander Bellos
  • Shaping of brittle materials with controlled surface and bulk properties
    Patent number: 9919380
    Abstract: Methods of and devices for forming edge chamfers and through holes and slots on a material that is machined using a laser, such as an ultrafast laser. The shaped material has predetermined and highly controllable geometric shape and/or surface morphology. Further, a method of and a device for preventing re-deposition of the particles on a material that is machined using a laser, such as an ultrafast laser. A fluid is used to wash off the particles generated during the laser machining process. The fluid can be in a non-neutral condition, with one or more chemical salts added, or a condition allowing the coagulation of the particles in the fluid, such that the particles can be precipitated to avoid the reattachment to the machined substrate.
    Type: Grant
    Filed: February 21, 2014
    Date of Patent: March 20, 2018
    Assignee: Coherent, Inc.
    Inventors: Ramanujapuram A. Srinivas, David M. Gaudiosi, Timothy Booth, Michael Shirk, Eric Juban, Michael Mielke
  • Apparatus for generating a line-beam from a diode-laser array
    Patent number: 9851571
    Abstract: Apparatus for generating a line-beam includes a diode-laser bar, a linear micro-lens array, and a plurality of lenses spaced apart and arranged along an optical axis. The linear micro-lens array and the lenses shape laser-radiation emitted by the diode-laser bar to form a uniform line-beam in an illumination plane. The lenses project a far-field image of the diode-laser bar onto an image plane proximate to the illumination plane. The diode-laser bar is rotated from parallel alignment with the linear micro-lens array for providing uniform line-beam illumination over a range of locations along the optical axis.
    Type: Grant
    Filed: August 15, 2016
    Date of Patent: December 26, 2017
    Assignee: Coherent, Inc.
    Inventors: Rui Zhang, Andrea Caprara
  • Uniformity adjustment method for a diode-laser line-projector
    Patent number: 9784957
    Abstract: In a line projector a diode-laser beam having an elliptical cross-section is projected onto a Powell lens which spreads the beam to form a line of light. Distribution of power along the line of light is adjusted by rotating the diode-laser beam with respect to the Powell lens.
    Type: Grant
    Filed: July 11, 2016
    Date of Patent: October 10, 2017
    Assignee: Coherent, Inc.
    Inventors: Erik Nackerud, Jimson Lounsbury, Patrick Kain
  • Transport of polarized laser-radiation using a hollow-core fiber
    Patent number: 9684125
    Abstract: 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: Grant
    Filed: April 13, 2016
    Date of Patent: June 20, 2017
    Assignee: Coherent, Inc.
    Inventors: Michael Hertwig, Norman Hodgson, Dmitri Simanovski
  • Current driver for diode laser system
    Patent number: 9667031
    Abstract: An architecture for current driver circuitry for diode laser systems is contemplated whereby the circuitry is both modular and minimally complex with respect to the number of components and connections.
    Type: Grant
    Filed: November 24, 2015
    Date of Patent: May 30, 2017
    Assignee: Coherent, Inc.
    Inventors: Ulrich Ritter, Jerry Chang
  • Multi-wavelength source of femtosecond infrared pulses
    Patent number: 9653867
    Abstract: 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: Grant
    Filed: April 4, 2014
    Date of Patent: May 16, 2017
    Assignee: Coherent, Inc.
    Inventors: Dmitri Simanovski, Norman Hodgson
  • Air-cooled carbon-dioxide laser
    Patent number: 9614342
    Abstract: A carbon dioxide waveguide-laser includes an elongated resonator unit and an elongated power-supply unit. The resonator and power-supply units are spaced by a cooling unit including a plurality of longitudinally extending, spaced-apart fins, with fans arranged to drive air through the spaces between the fins.
    Type: Grant
    Filed: April 16, 2015
    Date of Patent: April 4, 2017
    Assignee: Coherent, Inc.
    Inventors: Eric R. Mueller, Adrian Papanide
  • Tunable femtosecond laser-pulse source including a super-continuum generator
    Patent number: 9515445
    Abstract: 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: Grant
    Filed: December 3, 2015
    Date of Patent: December 6, 2016
    Assignee: Coherent, Inc.
    Inventors: Norman Hodgson, Dmitri Simanovski, Andrei Starodoumov
  • Water-cooled carbon-dioxide laser
    Patent number: 9419404
    Abstract: A carbon dioxide waveguide-laser includes an elongated resonator compartment and an elongated power supply compartment. The resonator and power-supply compartments are separated by a water-cooled heat sink.
    Type: Grant
    Filed: April 22, 2015
    Date of Patent: August 16, 2016
    Assignee: Coherent, Inc.
    Inventor: Eric R. Mueller
  • Via-hole drilling in a printed circuit board using a carbon monoxide laser
    Patent number: 9414498
    Abstract: Apparatus for drilling a via-hole in a printed circuit board (PCB) includes a carbon monoxide laser deliver laser radiation pulses. The pulses have a relatively broad wavelength-range, and slow rising and falling edges. The rising and falling edges of the pulses are clipped using and acousto-optic modulator. A dispersion-compensator compensates for dispersion in the clipped pulses introduced by the AOM. Achromatic focusing optics focus the dispersion-compensated, clipped pulses on the PCB for the via-hole drilling.
    Type: Grant
    Filed: September 20, 2013
    Date of Patent: August 9, 2016
    Assignee: Coherent, Inc.
    Inventors: Gongxue Hua, Eric R. Mueller
  • Uniformity adjustment method for a diode-laser line-projector
    Patent number: 9400391
    Abstract: In a line projector a diode-laser beam having an elliptical cross-section is projected onto a Powell lens which spreads the beam to form a line of light. Distribution of power along the line of light is adjusted by rotating the diode-laser beam with respect to the Powell lens.
    Type: Grant
    Filed: September 27, 2012
    Date of Patent: July 26, 2016
    Assignee: Coherent, Inc.
    Inventors: Erik Nackerud, Jimson Lounsbury, Patrick Kain
  • Method and apparatus for adjusting pulse parameters in a solid-state chirped-pulse amplifier system
    Patent number: 9385502
    Abstract: Optical apparatus for amplifying pulses in a pulsed laser-beam includes a pulse-stretcher having a single transmission-grating in a multi-pass configuration at a non-normal incidence angle. A regenerative amplifier amplifies stretched pulses in the laser-beam. A pulse-compressor including two spaced-apart reflection-gratings in a multi-pass configuration compresses the amplified pulses. Pulse-parameters of the compressed amplified pulses are optimized by iteratively adjusting the incidence angle of the pulsed laser-beam on the transmission-grating of the pulse-stretcher and the spacing between the reflection-gratings of the pulse-compressor.
    Type: Grant
    Filed: February 5, 2015
    Date of Patent: July 5, 2016
    Assignee: Coherent, Inc.
    Inventors: Mateusz Plewicki, Jean-Marc Heritier
  • Light-source including a planar array of diode-laser bars
    Patent number: 9377611
    Abstract: A light-source includes a planar array of diode-laser bars and a plurality of turning-mirrors arranged to stack beams from the diode-laser bars in the fast-axis direction to provide a first combined beam. Six plane mirrors are arranged to divide the combined beam into three beam-slices, each having one-third the slow-axis width of the first combined beam, and add the beam-slices in the fast-axis direction to provide a second combined beam having about one-third the slow-axis width and three-times the fast-axis length of those of the first combined beam. A spherical mirror and a cylindrical mirror focus the second combined beam into an optical fiber.
    Type: Grant
    Filed: May 16, 2014
    Date of Patent: June 28, 2016
    Assignee: Coherent, Inc.
    Inventors: Sergei Govorkov, John H. Jerman
  • CURRENT DRIVER FOR DIODE LASER SYSTEM
    Publication number: 20160149376
    Abstract: An architecture for current driver circuitry for diode laser systems is contemplated whereby the circuitry is both modular and minimally complex with respect to the number of components and connections.
    Type: Application
    Filed: November 24, 2015
    Publication date: May 26, 2016
    Applicant: Coherent, Inc.
    Inventors: Ulrich RITTER, Jerry CHANG
  • Laser-scribing of chemically strengthened glass
    Patent number: 9328011
    Abstract: A method is disclosed for scribing a contained crack or vent in a chemically strengthened glass sheet. The glass has shallow surface regions under compressive stress, bounding a central region under tensile stress. The vent is formed by rapidly bulk-heating the glass, using radiation from a carbon monoxide laser, to a depth just below a surface compressive region and extending marginally into the tensile stress region then rapidly cooling the heated region with a water mist spray. The glass sheet can be subsequently divided along the vent by application of mechanical or thermal stress.
    Type: Grant
    Filed: June 4, 2013
    Date of Patent: May 3, 2016
    Assignee: Coherent, Inc.
    Inventors: John F. Washko, Jr., Xinghua Li, Walter R. Bosenberg
  • Laser label-printer
    Patent number: 9290009
    Abstract: A laser label printer for use with a laser markable medium includes a laser-diode fiber-coupled to an optical train, which includes a focusing lens for focusing the radiation on the medium. The focusing lens is traversed across the medium, with incremental motion of the medium between traverses, for line by line printing of the label. The printer includes a feature for protecting the focusing lens from contamination, and self-diagnostic and adjustment features.
    Type: Grant
    Filed: February 4, 2015
    Date of Patent: March 22, 2016
    Assignee: Coherent, Inc.
    Inventors: Sergei Govorkov, John H. Jerman
  • Intelligent laser interlock system
    Patent number: 9281653
    Abstract: Systems and methods are disclosed for shutting down a laser system in an intelligent and flexible manner. An intelligent laser interlock system includes both hardwired components, and intelligent components configured to execute computing instructions. The hardwired components and the intelligent components are configured to shutdown the laser system to one or more alternative shutdown states in response to one or more interlock signals.
    Type: Grant
    Filed: July 19, 2012
    Date of Patent: March 8, 2016
    Assignee: Coherent, Inc.
    Inventors: Andrew D. Stadler, David Goldman, Mark Farley, Michael Mielke