Patents by Inventor Elizabeth D. Filer

Elizabeth D. Filer 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).

  • Ho:LuLF and Ho:Tm:LuLF laser materials
    Patent number: 5742632
    Abstract: A laser host material LuLF (LuLiF.sub.4) is doped with holmium (Ho) and thulium (Tm) to produce a new laser material that is capable of laser light production in the vicinity of 2 .mu.m. The material provides an advantage in efficiency over conventional Ho lasers because the LuLF host material allows for decreased threshold and upconversion over such hosts as YAG and YLF. The addition of Tm allows for pumping by commonly available GaAlAs laser diodes. For use with flashlamp pumping, erbium (Er) may be added as an additional dopant. For further upconversion reduction, the Tm can be eliminated and the Ho can be directly pumped.
    Type: Grant
    Filed: September 7, 1995
    Date of Patent: April 21, 1998
    Assignee: The United States of America as represented by the Administrator of the National Aeronautics and Space Administration
    Inventors: Norman P. Barnes, Clyde A. Morrison, Elizabeth D. Filer, Mahendra G. Jani, Keith E. Murray, George E. Lockard