Accession Number:

ADA113288

Title:

Anomalous Reflectivity Losses of Coated Mirrors Used in the Infrared,

Descriptive Note:

Corporate Author:

ROYAL SIGNALS AND RADAR ESTABLISHMENT MALVERN (ENGLAND)

Personal Author(s):

Report Date:

1982-01-01

Pagination or Media Count:

22.0

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 12 K sub 1212 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

Subject Categories:

  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE