Patents by Inventor Duncan Parsons-Karavassilis

Duncan Parsons-Karavassilis 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).

  • Laser apparatus
    Patent number: 7970039
    Abstract: In a first embodiment, the invention makes use of a Neodymium doped YAG (Nd:YAG) gain medium placed in an optical resonant cavity formed by two mirrors. Power extraction is maximized for a specific laser cavity. In particular the concave curvature on the rod ends contributes a negative lensing component to modify the strength of the thermal lens. In a second embodiment the present invention uses an amplifier rod medium with curved ends to act as lensing elements to collect emission from the laser gain medium and/or oscillator described in the first embodiment of the invention. The combination of thermal lens and curved rod ends produces a lensing effect which allows light to be directly coupled from a laser. In addition, variation of the input pump power allows for control of the thermal lens formed within the amplifier rod.
    Type: Grant
    Filed: February 23, 2005
    Date of Patent: June 28, 2011
    Assignee: Powerlase Ltd.
    Inventors: Michael Mason, Duncan Parsons-Karavassilis, Nicolas Hay, Matthew Kelly, Andrew Comley, Burly Cumberland, Michael Poulter
  • Laser Apparatus
    Publication number: 20080037597
    Abstract: In a first embodiment, the invention makes use of a Neodymium doped YAG (Nd: YAG) gain medium placed in an optical resonant cavity formed by two mirrors. Power extraction is maximized for a specific laser cavity. In particular the concave curvature on the rod ends contributes a negative lensing component to modify the strength of the thermal lens. In a second embodiment the present invention uses an amplifier rod medium with curved ends to act as lensing elements to collect emission from the laser gain medium and/or oscillator described in the first embodiment of the invention. The combination of thermal lens and curved rod ends produces a lensing effect which allows light to be directly coupled from a laser. In addition, variation of the input pump power allows for control of the thermal lens formed within the amplifier rod.
    Type: Application
    Filed: February 23, 2005
    Publication date: February 14, 2008
    Inventors: Michael Mason, Duncan Parsons-Karavassilis, Nicolas Hay, Matthew Kelly, Andrew Comley, Burly Cumberland, Michael Poulter