Patents by Inventor Karel Hamal

Karel Hamal 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 resonator with changable frequency of radiation
    Patent number: 4852107
    Abstract: A laser resonator has a semitransparent outlet mirror and a first mirror, with an active element between the mirrors, all the elements arranged perpendicular to the optical axis of the resonator. A shutter is provided behind the first mirror and a second mirror is arranged behind the shutter, perpendicular to the optical axis of the resonator. The second mirror is fully reflective for radiation with stronger laser transition and the first mirror is fully reflective for radiation with weaker laser transition and fully penetrable for radiation with stronger transition. The resonator can change frequency simply by opening or closing the shutter. It can be advantageously used, for example, in the design and construction of laser scalpels.
    Type: Grant
    Filed: April 28, 1987
    Date of Patent: July 25, 1989
    Assignee: Ceske vysoke uceni technicke v Praze
    Inventors: Karel Hamal, Jan Marek