Anomalous Reflectivity Losses of Coated Mirrors Used in the Infrared,

Abstract

It has recently been found that front-surfaced aluminium mirrors coated with a variety of thin protective layers have severe reflectivity losses when used at non-normal angles of incidence between 8 and 12 micron. This memorandum gives the mechanism for this anomalous loss and derives the condition that the loss will occur if cos theta sub o < (N sub 1(2) + K sub 1(2))/1/2 where theta sub o is the angle of incidence. Three materials proposed to replace the conventional oxides of silicon as protective coatings, and the reflectivity losses of tarnished aluminium mirrors, are discussed in section 4. (Author)

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Document Details

Document Type
Technical Report
Publication Date
Jan 01, 1982
Accession Number
ADA113288

Entities

People

  • G. J. Ball

Organizations

  • Royal Signals and Radar Establishment

Tags

Communities of Interest

  • Advanced Electronics

DTIC Thesaurus Topics

  • Absorption
  • Aluminum
  • Angle Of Incidence
  • Boundaries
  • Coatings
  • Coefficients
  • Materials
  • Metals
  • Mirrors
  • Optical Properties
  • Oxides
  • Protective Coatings
  • Reflection
  • Reflectivity
  • Reflectors
  • Refractive Index
  • Short Wavelengths

Fields of Study

  • Physics

Readers

  • Optical Physics and Photonics.
  • Statistical inference.
  • Surface Coatings Technology.