Accession Number : ADD006068

Title :   Electrooptical Detector Protection Device.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Falbel,Gerald ; Spangenberg,Peter E

Report Date : 08 May 1979

Pagination or Media Count : 4

Abstract : A protection device for an electro-optical detector used in systems for making far field diagnostic measurements of a high energy laser beam comprises a solid silicon cone having a truncated apex which functions as the pin hole aperture for the detector. The large end of the cone has a surface defined by the radius drawn from the cone axis at the truncation. This surface is coated with a reflective attenuation layer which reflects a high percentage of the energy of the incident laser beam entering the pinhole aperture thereby minimizing the absorption of the beam by the cone. The high index of refraction of the solid silicon cone permits large off-axis angles of the laser beam to be directed onto the detector resultingly increasing the field of view allows a closer spacing of a plurality of detectors in the system ensuring a high spatial resolution of the laser beam for a desired field of view. (Author)

Descriptors :   *Patents, *Optical detectors, *Protective coverings, *Laser beams, Pulsed lasers, electrooptics, Far field, Angle of arrival, Conical bodies, High energy, Silicon, Refractive index

Subject Categories : Lasers and Masers
      Test Facilities, Equipment and Methods

Distribution Statement : APPROVED FOR PUBLIC RELEASE