Y<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> 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 Cr<sup>4+</sup> 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
Xiaodong Xu, Zhiwei Zhao, Pingxin Song, Guoqing Zhou, Jun Xu, and Peizhen Deng, "Effects of growth atmosphere, annealing temperature, Cr content, and Ca/Cr ratio on the Cr4+ absorption of Cr, Yb:YAG crystals," J. Opt. Soc. Am. B 21, 1289-1293 (2004)