Abstract
The extinction coefficients of three commercial organic glasses referenced CR-39, MR-8 and MR-10 were determined from reflectance and transmittance spectra in the near-UV to visible region, using two different approaches. The first approach consists in the optimization of the extinction coefficient to fit the calculated transmittance to the optical measurements with a UV–Visible spectrometer. The second approach uses a simplified analytical expression of the extinction coefficient as a function of transmittance proposed in an article by S. Nemoto. The two calculation methods are compared and discussed. A table of complex refractive indices (including the determined extinction coefficients) is provided in the appendix, for open use.
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