Development of Chemical-Vapor-Deposited Diamond for Infrared OpticalApplications. Status Report and Summary of Properties

摘要

This report summarizes results of Navy contracts with Raytheon Research Division,Texas Instruments, and Norton Company for the development of chemical-vapor-deposited (CVD) optical-quality bulk diamond from October 1990 through April 1993 and characterization through December 1993. Clear windows with thickness of 0.3 to 1.0 millimeter (mm) and diameters up to 25 mm were produced. In the 8-to-14 micrometer infrared region, the absorption coefficient was as low as 0.1 to 0.3 cm(-1), optical scatter was below 1% and emissivity was below 3% at 500 deg C for 0.5-to-1 mm thick samples. Microwave dielectric properties, thermal properties, and most mechanical properties of chemical-vapor-deposited diamond were equivalent to those of Type IIa natural diamond. The mechanical strength of 0.5-to-1 mm thick CVD diamond attained so far is an order of magnitude lower than of natural diamond and is governed by microscopic cracks and detects. (Author).