220-fs erbium-ytterbium:glass laser mode locked by a broadband low-loss silicon/germanium saturable absorber.
Grawert FJ, Gopinath JT, Ilday FO, Shen HM, Ippen EP, K?rtner FX, Akiyama S, Liu J, Wada K, Kimerling LC. 220-fs erbium-ytterbium:glass laser mode locked by a broadband low-loss silicon/germanium saturable absorber. Opt Lett. 2005 Feb 01; 30(3):329-31.