Stack and dump: Peak-power scaling by coherent pulse addition in passive cavities S. Breitkopf, T. Eidam, A. Klenke, H. Carstens, S. Holzberger, E. Fill, T. Schreiber, F. Krausz, A. Tünnermann, I. Pupeza and J. Limpert Eur. Phys. J. Special Topics, 224 13 (2015) 2573-2577 Published online: 26 October 2015 DOI: 10.1140/epjst/e2015-02567-7