• Protective optical filter assembly
    Patents
    US Patent # 6,918,673
    Granted July 19, 2005
    Inventors: Robert L. Johnson, Natalia Gorawski, Barry O'Dwyer

    A hermetic filter assembly which improves filter life and environmental stability. The elimination of optical epoxies in this air-spaced filter results in reduced auto-fluorescence, improved parallelism and flatness, and improved heat tolerance. 3rd Millennium filters were originally based on this technology- currently RapidBand filters are made with a similar technique. 

    Bandpass
    Fluorescence Imaging
    Defense
    LIDAR and Optical Communications
    Gas Sensing
    Filter Design
  • Optical filters for forming enhanced images
    Patents
    US Patent # 5,646,781
    Granted July 8, 1997
    Inventor: Robert L. Johnson, Jr.

    This patent for a triple-bandpass coating is significant for its image enhancement capability. This coating transmits bands of pure color while eliminating the regions of “color confusion” while viewing by eye. Major markets include backyard astronomy, binoculars, gun sights, etc. Omega's tradename for this design is Spectraplus.

    Multiband filters
  • Graded Period Rugates
    Conference proceedings
    Proc. SPIE 2046, Inhomogeneous and Quasi-Inhomogeneous Optical Coatings, 147 (November 2, 1993); http://dx.doi.org/10.1117/12.163552
    Capabilities
    Filter Design
  • Optical filter
    Patents
    US Patent # 5,173,808
    Granted April 10, 1989
    Inventors: Willem F. Auer, John A. Brown, William A. Thornton

    A triple-band filter that aim to provide laser protection while maintaining color balance in the visual field.

    Multiband filters
  • Ultraviolet Filters- Past and Present
    —New!
    Articles
    Robert L. Johnson and Sarah Locknar; reprinted from the 2019 issue of Photonics Handbook, Laurin Publishing
    UV Filters
    Bandpass
    Shortpass
    Filter Design