Abstract

Measurements of the near-normal solid-state-pellet reflectance of five commercially available color pigments are used to calculate the frequency-dependent complex index of refraction with the Kramers–Kronig relationship. Although it is conceptually simple, the Kramers–Kronig analysis is very sensitive to the choice of extrapolation constants that describe the reflectance behavior outside the accessible frequency range, especially in the ultraviolet. We develop a method to obtain accurate optical property data in the visible region by minimizing the difference between the absorbance calculated from the refractive index and the separately measured absorption spectrum through an appropriate choice of the high-frequency extrapolation exponent. Root-mean-square differences as low as 3% can be achieved.

© 1993 Optical Society of America

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