Abstract
This study presents results for the high-temperature (up to 1550 K) optical properties of polycrystalline Cr-doped -alumina materials. Diffuse reflectance spectra in the wavelength range of 510–840 nm are presented as a function of temperature to illustrate changes to the optical behavior of these materials including a previously unreported thermally activated splitting of the U-band absorption () in octahedrally coordinated . Measurements were made using a unique laser-based approach for high-temperature solid-state spectroscopy, involving front-side supercontinuum laser illumination and back-side laser heating. This approach required development of samples that could withstand related thermal stresses, and measurements were made on plasma-sprayed, Cr-doped -alumina monoliths. Measured spectra are interpreted, in part, using published optical spectra for ruby; agreement between results here with those obtained using more traditional methods serves to validate the measurement methods used for this work.
© 2017 Optical Society of America
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