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1 October 1990Update on diamond and diamond-like carbon coatings
This paper reviewed the infrared uses of diamond-like carbon thin films and the
potential uses of synthetic diamond layers.
Diamond-like carbon is used widely as a protective anti-reflection coating for
exposed germanium infrared windows and lenses and as thin protective coatings for
front surface aluminium mirrors.
This material is also used in protective anti-reflective coatings for zinc
sulphide as the outer thin film in multi-layer designs incorporating variable
index intermediate layers of germanium carbide.
The maximum thickness of diamond-like carbon that can be used is often limited by
the stress induced in the layer through the method of deposition and by the
absorption present in the basic material.
This stress and absorption can be far lower in synthetic diamond layers but there
are now problems associated with the high substrate temperatures, difficulties in
coating large areas uniformly and problems arising from surface scattering and
low deposition rates.
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Alan H. Lettington, "Update on diamond and diamond-like carbon coatings," Proc. SPIE 1320, Infrared Technology and Applications, (1 October 1990); https://doi.org/10.1117/12.22347