Accession Number : ADD000933

Title :   High Intensity Light Limiting Device.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON D C

Personal Author(s) : Sztankay,Zoltan G ; Holland,Richard J ; Swirczynski,John P

Report Date : 22 May 1973

Pagination or Media Count : 8

Abstract : The patent discloses an optical device for limiting the transmission of high intensity light radiation through an optical system. The device includes a limiting mirror consisting of a thin evaporative partially absorbing, partially reflective coating deposited on a radiation absorbing substrate. An objective lens is provided to focus incident light on a portion of the limiting mirror to maximize the energy density of the incident light beam. If the energy density of the focused beam exceeds a predetermined level, a small portion of the reflective coating is vaporized, markedly reducing the reflectivity of that portion of the limiting mirror. A portion of the substrate material may also be vaporized if the focused beam is of a particularly high energy density.

Descriptors :   *Laser safety, *Safety devices, *Patents, Coherent radiation, Laser beams, Optical equipment, Mirrors, Coatings, Reflectivity, Lenses

Subject Categories : Lasers and Masers
      Safety Engineering

Distribution Statement : APPROVED FOR PUBLIC RELEASE