Abstract

${\mathrm{Y}}_3{\mathrm{Al}}_5{\mathrm{O}}_{12}$ single crystals codoped with ytterbium and chromium were successfully grown by the Czochralski method. The effects of growth atmosphere, annealing temperature, the initial Cr content in the melt, and Ca/Cr ratio on the absorption characteristics of tetravalent ${\mathrm{Cr}}^{4+}$ have been evaluated. The fluorescence lifetimes of Cr, Yb:YAG with various concentrations of Cr and Yb:YAG were measured. The optimum annealing temperature, initial Cr content in the melt, and Ca/Cr ratio are given.

© 2004 Optical Society of America

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