Abstract
We analyze the random process of fluorescence reabsorption and trapping in
solid-state optical materials in general and its influence on the efficiency of
optical cooling of solids by anti-Stokes fluorescence in particular. Using the
absorption and fluorescence spectra of
Yb3+:ZrF4-BaF2-LaF3-AlF3-NaF
(ZBLAN) as input data, we employ a random-walk model to test analytical
approximations of the fluorescence escape efficiency and cooling efficiency,
including reflections at the boundary.
© 2005 Optical Society of America
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