Abstract
The optical constants, the absorption coefficients, and the Fermi energies of the quartz and the polymethyl methacrylate glasses are determined from the reflectance and the transmittance spectrograms of their slabs. These parameters are related to the Fresnel interface reflectance and transmittance by means of rigorous formulae taking into account the incoherent interference and the attenuation of light inside the slab. An iteration procedure is adopted in order to determine the Fresnel and the attenuation coefficients, which lead directly to the determination of the refractive index and the extinction coefficient. The dispersions of these two parameters are compared for the two given glasses inside two wide spectral windows bounded by two strong absorption bands at the extreme ultraviolet and infrared ends of the spectral range: 0.2–3 μm.
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