Patents by Inventor Douglas Earl Holmgren

Douglas Earl Holmgren 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).

  • DUAL-BEAM LASER PROCESSING SYSTEM
    Publication number: 20110134525
    Abstract: A system for forming two laser processing beams with controlled stability at a target specimen work surface includes first and second mutually coherent laser beams propagating along separate first and second beam paths that are combined to perform an optical property adjustment. The combined laser beams are separated into third and fourth laser beams propagating along separate beam paths and including respective third and fourth main beam components, and one of the third and fourth laser beams contributes a leakage component that copropagates in mutual temporal coherence with the main beam component of the other of the third and fourth laser beams. An effect of mutual temporal coherence of the leakage component and the other main beam component with which the leakage component copropagates is reduced through acousto-optic modulation frequency shifts or through incorporation of an optical path length difference in the two beams.
    Type: Application
    Filed: February 14, 2011
    Publication date: June 9, 2011
    Inventors: Douglas Earl Holmgren, Ho Wai Lo, Philip Mitohell Conklin
  • Reducing coherent crosstalk in dual-beam laser processing system
    Patent number: 7888620
    Abstract: A method of and system for forming two laser processing beams with controlled stability at a target specimen work surface includes first and second mutually coherent laser beams propagating along separate first and second beam paths that are combined to perform an optical property adjustment. The combined laser beams are separated into third and fourth laser beams propagating along separate beam paths and including respective third and fourth main beam components, and one of the third and fourth laser beams contributes a leakage component that copropagates in mutual temporal coherence with the main beam component of the other of the third and fourth laser beams. An effect of mutual temporal coherence of the leakage component and the other main beam component with which the leakage component copropagates is reduced through acousto-optic modulation frequency shifts or through incorporation of an optical path length difference in the two beams.
    Type: Grant
    Filed: July 31, 2006
    Date of Patent: February 15, 2011
    Assignee: Electro Scientific Industries, Inc.
    Inventors: Douglas Earl Holmgren, Ho Wai Lo, Philip Mitchell Conklin
  • Reducing coherent crosstalk in dual-beam laser processing system
    Publication number: 20080023447
    Abstract: A method of and system for forming two laser processing beams with controlled stability at a target specimen work surface includes first and second mutually coherent laser beams propagating along separate first and second beam paths that are combined to perform an optical property adjustment. The combined laser beams are separated into third and fourth laser beams propagating along separate beam paths and including respective third and fourth main beam components, and one of the third and fourth laser beams contributes a leakage component that copropagates in mutual temporal coherence with the main beam component of the other of the third and fourth laser beams. An effect of mutual temporal coherence of the leakage component and the other main beam component with which the leakage component copropagates is reduced through acousto-optic modulation frequency shifts or through incorporation of an optical path length difference in the two beams.
    Type: Application
    Filed: July 31, 2006
    Publication date: January 31, 2008
    Inventors: Douglas Earl Holmgren, Ho Wai Lo, Philip Mitchell Conklin