Accession Number : ADD017893

Title :   Anti-Reflection and Anti-Oxidation Coatings for Diamond.

Descriptive Note : Patent, Filed 11 Aug 92, patented 5 Dec 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Johnson, Linda F ; Klemm, Karl A ; Moran, Mark B

Report Date : 05 Dec 1995

Pagination or Media Count : 8

Abstract : Coatings for a diamond surface of an optical element control reflections and oxidation at the surface. Transmissive element coatings effective in the infrared and at up to 800 deg C. have a first layer of amorphous hydrogenated silicon deposited directly on the diamond and have a second layer of aluminum nitride, yttrium oxide, hafnium oxide or other refractory oxide deposited directly on the first layer. The first layer may be relatively thin and for adhesion only with the second layer constructed of an oxide and having a thickness selected to control reflection, or the thicknesses of both layers may be selected together to control reflection with the proportion of hydrogen in the first layer varied to select its refractive index.

Descriptors :   *DIAMONDS, *COATINGS, *ANTIREFLECTION COATINGS, *ANTIOXIDANTS, *PATENTS, CONTROL, THICKNESS, ALUMINUM COMPOUNDS, HAFNIUM COMPOUNDS, LAYERS, ADHESION, REFRACTIVE INDEX, REFLECTION, NITRIDES, HYDROGEN, SURFACES, OXIDATION, OXIDES, SILICON, INFRARED RADIATION, OPTICAL EQUIPMENT COMPONENTS, REFRACTORY MATERIALS, HYDROGENATION, YTTRIUM OXIDES

Subject Categories : Coatings, Colorants and Finishes
      Inorganic Chemistry
      Physical Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE