Abstract
A method is described for determining the optical constants of a thin film deposited on a nonabsorbing window using a single set of transmittances over an absorption band. The method depends on the fact that the phase shift of the transmitted radiation can be determined from the transmittances by a Kramers–Kronig transform. No assumption of a physical model or band shape is required. Practical implementation of the method is numerically complicated, and the use of a digital computer is essential.
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