Measurements are reported of the spectroscopic properties (absorption and emission spectra, stimulated-emission cross section, and radiative lifetime) of (Yb<sub>x</sub>Y<sub>1−x</sub>)<sub>3</sub>Al<sub>5</sub>O<sub>12</sub> for nominal <i>x</i> values of 0.025, 0.05, 0.1, 0.2 and 0.3 at temperatures of 15–300 K. The emission cross sections of Yb:YAG with different Yb<sup>3+</sup> concentrations were determined by use of the Füchtbauer–Ladenburg formula and the reciprocity method. At low temperatures, the product (στ) of the effective stimulated-emission cross section and the radiative lifetime is greater than at room temperature for all concentrations. Product στ is nearly independent of Yb<sup>3+</sup> concentration at a given temperature. These results will aid in the design of high-power thin disk lasers by use of highly doped Yb:YAG.
© 2003 Optical Society of America
Jun Dong, Michael Bass, Yanli Mao, Peizhen Deng, and Fuxi Gan, "Dependence of the Yb3+ emission cross section and lifetime on temperature and concentration in yttrium aluminum garnet," J. Opt. Soc. Am. B 20, 1975-1979 (2003)