Patents by Inventor Carl H. Petras

Carl H. Petras 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).

  • CW pumper CW pumped variable repetition rate regenerative laser amplifier system
    Patent number: 4896119
    Abstract: A CW pumped regenerative laser amplifier system capable of producing amplified laser pulses of variable repetition rate (e.g., 10 Hz to 10 kHz) with high energy stability. The regenerative amplifier is seeded by pulses injected into the optical cavity of the amplifier from a CW pumped modelocked laser.
    Type: Grant
    Filed: June 7, 1984
    Date of Patent: January 23, 1990
    Assignee: The University of Rochester
    Inventors: Steven L. Williamson, Girard Mourou, Irl N. Duling, III, Philippe Bado, Carl H. Petras
  • Pockels cell driver
    Patent number: 4620113
    Abstract: A Pockels cell driver useful to operate the Pockels cell as an optical shutter to select one or more laser pulses out of a train of laser pulses when the Pockels cell is placed between crossed polarizers. The Pockels cell is connected through a storage capacitor, of higher capacitance than the capacitance of the Pockels cell, directly to a high voltage source and is charged to high voltage. The cell is charged and the storage capacitor is discharged through a microwave triode which is triggered by an avalanche transistor switch circuit. By directly charging the Pockels cell, lower currents are used than with conventional Pockels cell drivers using transmission lines to connect to the Pockels cell and gas filled tubes to switch a pulse-forming line.
    Type: Grant
    Filed: February 17, 1984
    Date of Patent: October 28, 1986
    Assignee: The University of Rochester
    Inventors: Theodore Sizer, II, Irl N. Duling, III, Carl H. Petras, Samuel A. Letzring