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A Comparison of Algorithms for Predicting Optical Constants
Three programs were written to compute the optical constants of materials from normal incidence reflectance measurements. These include a Kramers-Kronig technique, a Fourier series algorithm, and an oscillator matching method. Each approach was used to calculate n and k for potassium bromide from measured reflectance data between 55-250 µm. A 1% uncertainty in the reflectance data result~d in a 5%-10% uncertainty in the optical constants computed by the Kramers-Kronig analysis. The difficultydoi:10.2172/1465714 fatcat:tq3mdemklrcztolx4rtuyaqfmm