Abstract
In this study we have determined the optical constants (δ & β) spectra of α-Al2O3 near the Al L2,3 and O-K absorption edge region using reflectance spectroscopy technique. We have used Kramers-Kronig relations to extract scontinuous spectra of absorption part (β) and the dispersion part (δ) of optical constants, which is generally very difficult to measure. The optical constants spectra near the Al L2,3 edge clearly shows a well resolved L2 and L3 features with a spin orbit splitting of 0.4 eV. The various features appearing in the optical constant (β) profile are correlated with the absorption spectra depicting the origin of these features. The information of experimentally determined optical constants will greatly be useful in interpreting reflectivity performance of α-Al2O3 used as optical devices.
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