Abstract

Temperature-dependent diffuse reflectance measurements on Cr-doped $\alpha$-alumina monoliths have been performed using supercontinuum-laser illumination and ${\mathrm{CO}}_2$-laser heating. These measurements have been interpreted using an extended Kubelka–Munk (K-M) model describing diffuse-light propagation in highly scattering and fluorescent media to assess the temperature dependence of fluorescence quantum efficiency. Analysis of experimental results has provided a qualitative understanding of the temperature-dependent conditions for model applicability and also suggests methods for using supercontinuum-laser diffuse reflectance spectroscopy for detection of unknown fluorescent dopants.

© 2019 Optical Society of America

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