Abstract
This chapter describes the experiment techniques essentially used for measuring refractive index n and extinction coefficient k for the visible-ultraviolet and the vacuum ultraviolet. In the infrared near the transverse optic mode, where the absorption coefficient α is too large to allow transmission T measurements using the thinnest samples available, bulk reflectance R measurements at near normal incidence are performed. Values for n and k are obtained from a Kramers-Kronig (KK) analysis or by fitting R within the experimental error by the classical dispersion theory. As a byproduct of this procedure, the optical constants are calculated and checked against T measurements in the regions outside the fundamental band. At longer wavelengths, transmission samples of thicknesses from 30 μm to 1 mm are essentially used; k is derived from T and R, including multiple reflection effects and n is deduced from the interference transmission pattern. It is noted that differences in the free-carrier concentration has no effect on R.
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