Reflectance and preparation of front-surface mirrors for use at various angles of incidence from the ultraviolet to the far infrared

Details Reflectance and preparation of front-surface mirrors for use at various angles of incidence from the ultraviolet to the far infrared Reflectance and preparation of front-surface mirrors for use at various angles of incidence from the ultraviolet to the far infrared

Jan 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982josa...72...27h&link_type=abstract

Optical Society of America, Journal, vol. 72, Jan. 1982, p. 27-39.

Computer Science

8

Far Infrared Radiation, Infrared Reflection, Mirrors, Reflectance, Ultraviolet Reflection, Aluminum Oxides, Angular Distribution, Dielectrics, Metal Coatings, Optical Materials, Silver

Scientific paper

Methods for measuring the reflectance of front-surface mirrors at various wavelengths and angles of incidence are discussed, and techniques for preparing reflecting films with maximum reflectance and durability are described. Data are presented on the UV, visible, and infrared reflectance of the most frequently used mirror coatings: Al, Ag, Au, and Rh. Single-layer and multilayer dielectric overcoatings are applied to increase durability and normal-incidence reflectance; the effect of these coatings on reflectance at higher angles of incidence is discussed. It is shown that, in the infrared from 8 to 12 microns, Al and Ag, overcoated with thin layers of silicon oxides or Al2O3, have almost the same high reflectance as the unprotected metal at close to normal incidence, but greatly decreased reflectance at angles larger than 40 deg. Since only the parallel component is responsible for the infrared reflectance decrease, such film combinations are suitable for producing highly efficient reflection polarizers for the infrared radiation. The determination of water absorption in dielectric overcoatings and its effect on the mirror reflectance at 3 microns (where water has the highest extinction coefficient) is discussed.

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