Optimization of ultrafast Yb-doped fiber amplifiers to achieve high-quality compressed pulses Jinkang Lim, Hung-Wen Chen, Anne-Laure Calendron, Guoqing Chang and Franz X. Kärtner EPJ Web of Conferences, 41 (2013) 10020 Published online: 13 March 2013 DOI: 10.1051/epjconf/20134110020