Patents by Inventor Charles Durfee

Charles Durfee 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).

  • Spatially chirped pulses for femtosecond laser ablation through transparent materials
    Patent number: 9545689
    Abstract: Temporal focusing of spatially chirped femtosecond laser pulses overcomes previous limitations for ablating high aspect ratio features with low numerical aperture (NA) beams. Simultaneous spatial and temporal focusing reduces nonlinear interactions, such as self-focusing, prior to the focal plane so that deep (˜1 mm) features with parallel sidewalls are ablated at high material removal rates.
    Type: Grant
    Filed: December 9, 2013
    Date of Patent: January 17, 2017
    Assignee: Colorado School of Mines
    Inventors: Jeffrey Squier, Dawn Vitek, Charles Durfee, Daniel Adams, David Kleinfeld
  • Spatially chirped pulses for femtosecond laser ablation through transparent materials
    Publication number: 20140103018
    Abstract: Temporal focusing of spatially chirped femtosecond laser pulses overcomes previous limitations for ablating high aspect ratio features with low numerical aperture (NA) beams. Simultaneous spatial and temporal focusing reduces nonlinear interactions, such as self-focusing, prior to the focal plane so that deep (˜1 mm) features with parallel sidewalls are ablated at high material removal rates.
    Type: Application
    Filed: December 9, 2013
    Publication date: April 17, 2014
    Applicant: Colorado School of Mines
    Inventors: Jeffrey Squier, Dawn Vitek, Charles Durfee, Daniel Adams, David Kleinfeld
  • Spatially chirped pulses for femtosecond laser ablation through transparent materials
    Patent number: 8669488
    Abstract: Temporal focusing of spatially chirped femtosecond laser pulses overcomes previous limitations for ablating high aspect ratio features with low numerical aperture (NA) beams. Simultaneous spatial and temporal focusing reduces nonlinear interactions, such as self-focusing, prior to the focal plane so that deep (˜1 mm) features with parallel sidewalls are ablated at high material removal rates.
    Type: Grant
    Filed: March 30, 2011
    Date of Patent: March 11, 2014
    Assignee: Colorado School of Mines
    Inventors: Jeffrey Squier, Dawn Vitek, Charles Durfee, Daniel Adams, David Kleinfeld
  • Spatially chirped pulses for femtosecond laser ablation through transparent materials
    Publication number: 20110297651
    Abstract: Temporal focusing of spatially chirped femtosecond laser pulses overcomes previous limitations for ablating high aspect ratio features with low numerical aperture (NA) beams. Simultaneous spatial and temporal focusing reduces nonlinear interactions, such as self-focusing, prior to the focal plane so that deep (˜1 mm) features with parallel sidewalls are ablated at high material removal rates.
    Type: Application
    Filed: March 30, 2011
    Publication date: December 8, 2011
    Inventors: Jeffrey Squier, Dawn Vitek, David Kleinfeld, Daniel Adams, Charles Durfee
  • Method for producing high intensity optical through x-ray waveguide and applications
    Patent number: 5394411
    Abstract: Optical guiding of intense laser pulses over a distance of more than one Rayleigh length in a plasma is discussed herein using a multi-pulse technique. The first pulse or pulse sequence prepares a shock-driven, axially-extended radial electron density profile which guides a second pulse or sequence of pulses. The profile is also capable of guiding x-rays. The channel will support mode structure exactly analogous to that of an optical fiber waveguide. The method provides a means for guiding of a high intensity optical laser pulse or x-rays over distances well in excess of a Rayleigh length. The distances over which guiding occurs is limited only by the length of the preformed plasma and absorption and possible backscattering of the guided EM radiation. Applications of the method allow for compact x-ray laser devices and electron particle accelerators.
    Type: Grant
    Filed: February 16, 1994
    Date of Patent: February 28, 1995
    Assignee: University of Maryland, College Park
    Inventors: Howard Milchberg, Charles Durfee, III