J. Boquillon, E. Georgiou, G. Stivaktakis, A. Souliotis, and O. Musset, "Diode-pumped Er:Yb:Glass 1.54µm laser with 1.23 output and 25% optical efficiency,"
in Advanced Solid-State Lasers, M. Fermann and L. Marshall, eds.,
Vol. 68 of Trends in Optics and Photonics Series
(Optical Society of America, 2002), paper TuB4.