Accession Number : ADD018451

Title :   Discrete Vacuum Ultra Violet Reflective Interference Filter.

Descriptive Note : Patent, Filed 27 Jul 93, patented 18 Feb 97,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Hunter, William R ; Long, James P

Report Date : 18 Feb 1997

Pagination or Media Count : 11

Abstract : A thin film reflecting interference filter (RIF) is designed to suppress unwanted harmonics thereby improving the monochromaticity of the radiation. An interference layer of material which has a well-defined plasma oscillation is deposited on a substrate and a mismatch layer is formed thereon. This interference layer exploits the interference between wavefronts reflected from the layer-substrate and the vacuum-layer interfaces to suppress higher order harmonics, while allowing good reflectance at the fundamental wavelength. This is achieved by positioning the RIF in the radiation at an angle of incidence which is greater than the critical angle of the desired fundamental wavelength, but less than critical angles of the harmonics to be suppressed. The mismatch layer increases the reflectance of the unwanted harmonics at the vacuum-layer interface, thus allowing more complete destructive interference of the unwanted harmonics. The RIF can be tuned by altering the thickness of the layer, the composition of the layer and/or the angle of incidence of the radiation.

Descriptors :   *PATENTS, *ULTRAVIOLET FILTERS, HARMONICS, THIN FILMS, VACUUM ULTRAVIOLET RADIATION, REFLECTANCE, REFLECTIVITY, ANGLE OF INCIDENCE, WAVEFRONTS, PLASMA OSCILLATION, ULTRAVIOLET SPECTRA

Subject Categories : Optics

Distribution Statement : APPROVED FOR PUBLIC RELEASE