Accession Number : ADD014197

Title :   High Power Optical Attenuator.

Descriptive Note : Patent, filed 1 Jun 87, patented 31 May 88,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Marrs, C D ; Faith, William N

Report Date : 31 May 1988

Pagination or Media Count : 6

Abstract : An attenuator for high power laser beams, the attenuator has an annular beam dump through which the beam passes diametrically and in which the beam passes successively through a pair of pivoting transmissive and reflective element. These elements are individually mounted on intermeshed gears so that the elements are adjustable through equal and opposite angles. At each element a portion of the beam is reflected toward the dump and a portion transmitted, the relative energy in each portion being determined by the angle of the elements to the beam so that adjustment of this angle determines the amount of attenuations. The beam is offset oppositely by refraction at each element so that attenuator does not change the beam path. The elements are, preferably, elements commonly used as edge filters, that is, interference filters having an abrupt monotonic transition with wavelength from reflection to transmission. Patents. (RH)

Descriptors :   *ATTENUATORS, *GEARS, *PATENTS, *PATHS, *REFLECTION, *TRANSMITTANCE, EDGES, ENERGY, FILTERS, HIGH POWER, INTERFERENCE, LASER BEAMS, OPTICAL PROPERTIES, REFLECTIVITY, REFRACTION

Subject Categories : Optics
      Machinery and Tools
      Lasers and Masers

Distribution Statement : APPROVED FOR PUBLIC RELEASE