The use of IR optical substrates and thin-films is an integral part of optical system construction for remote
sensing instrumentation. From telescopes to multi-spectral imagers, entire optical systems can be built with a relatively
small set of materials. The temperature dependence of the optical, mechanical and electronic properties of bulk infrared
(IR) materials has been well characterized in the literature [1-5]. Manufacturer and research reports provide some
representation of the impact of temperature excursions on the index of refraction (dn/dT), and the absorption profile
(dk/dT) of bulk crystalline germanium (Ge) and synthetic crystalline zinc sulphide (ZnS). The availability of empirical
data for thin-films, however, is much more limited. These optical constants for as-deposited amorphous thin-films of Ge
and ZnS are investigated. Models for the temperature dependent refractive index have been developed using
transmittance and reflectance data over the wavelength region between 2.0-20.0 μm. The spectra of manufactured filters
are characterized at ambient and cryogenic temperatures (300K-50K) in order to validate the models developed.
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