Accession Number : AD0781790

Title :   Low Absorptance Metallic Coatings for Metallic Substrates.

Descriptive Note : Final rept. 28 Jun 72-15 Jan 74,


Personal Author(s) : Kurdock,John R.

Report Date : JUN 1974

Pagination or Media Count : 81

Abstract : The program resulted in producing the fabrication technology that is required for high-energy 10.6 micrometer laser programs now underway. Polishing and coating techniques for metallic substrates were developed and the deposition of metallic coatings to reproducibly create metal mirror surfaces with low absorptance of a wavelength of 10.6 micrometer was investigated. The basic task was one of expanding and transferring to metal substrates the technology developed by Bennett and Ashley for fused silica substrates. Metal substrates of molybdenum, TZM, and beryllium-copper were polished to a surface roughness of from 12 A to 15 A rms and overcoated with ultra-high-vacuum silver and ggold. Absorption coefficients obtained were as low as 0.0064. The basic finishing technique that is now employed is acid etch stress relieving and controlled grinding, modified conventional polishing techniques, sputtering of similar metallic film, and modified conventional polishing. (Modified author abstract)

Descriptors :   *Optical coatings, *Metal coatings, *Mirrors, *Laser materials, Silver, Gold, High energy, Substrates, Optics, Polishes, Protective coatings, Carbon dioxide lasers, Sputtering, Absorption, Infrared lasers, Surfaces, Molybdenum, Molybdenum alloys, Copper alloys

Subject Categories : Coatings, Colorants and Finishes

Distribution Statement : APPROVED FOR PUBLIC RELEASE