Journal
OPTICAL MATERIALS
Volume 34, Issue 6, Pages 965-968Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2011.05.036
Keywords
CaF2; Ytterbium; Transparent ceramics; Spectroscopy
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In Yb:CaF2, the coordination of Yb3+ in the CaF2 lattice determines the spectroscopic properties that make Yb:CaF2 a good candidate for high power laser applications. In this work, we measure the optical absorption, emission, and fluorescence lifetime of 0.1, 1, 5, and 10 at% Yb:CaF2 ceramics to determine whether Yb3+ substitutes as hexamer clusters giving rise to the tenability and long fluorescent lifetime observed in Yb:CaF2 single crystals. Absorption and emission spectra show that the concentration of Yb3+ present in hexamer clusters, as opposed to isolated ions, increases with increasing Yb3+ content. Fluorescence lifetime also increases with increasing Yb3+ content. Laser testing on a 1 at% Yb:CaF2 transparent ceramic demonstrates that these materials are viable laser gain media. (C) 2011 Elsevier B.V. All rights reserved.
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