Abstract

This paper presents an analysis of whether the optical constants of films can be determined from their transmission and reflection spectra. It is shown that such a problem cannot be unambiguously solved at separate points or on small sections of the spectrum, and ways are found to get around this difficulty. A spectrophotometric method is proposed for finding the optical constants of films, including correction of the spectra for absorption and the successive use of given sections of the spectrum. The optimum width of the sections of the spectrum is determined for finding an unambiguous solution. As an example, the given method is used to determine the optical constants of a CaY₂F₈ film in the 1.3–17 µm spectral region.

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