Single-shot determination of focused FEL wave fields using iterative phase retrieval
By Masoud Mehrjoo, Klaus Giewekemeyer, Patrik Vagovič, Stephan Stern, Richard Bean, Marc Messerschmidt1, Barbara Keitel, Elke Plönjes, Marion Kuhlmann, Tobias Mey, Evgeny A. Schneidmiller, Mikhail V. Yurkov, Torsten Limberg, Adrian P. Mancuso