Abstract

We propose a method for determining the optical constants of materials used in transmission optics. This technique is based on correction of absorption spectra. The absorption A may be divided into two parts: A_T describes the contribution of absorption to the transmission spectrum, and A_R describes the contribution of absorption to the reflection spectrum. The A_T and A_R spectra used to correct the RT spectra were calculated using correction functions and the total absorption A. Correction removes absorption from the spectra, so that the existing methods for determining the refractive index n can be used. We obtain analytical expressions for the absorption coefficient α and assess the accuracy of the method; this assessment indicated that spectral correction enables n to be determined to a maximum accuracy of 0.0001. The method was tested on optical silicon near the 9-μm absorption band.

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