Open AccessSingle-shot determination of focused FEL wave fields using iterative phase retrieval
Author(s) -
Masoud Mehrjoo,
Klaus Giewekemeyer,
Patrik Vagovič,
Stephan Stern,
Richard Bean,
Marc Messerschmidt,
Barbara Keitel,
Elke Plönjes,
Marion Kuhlmann,
Tobias Mey,
E.A. Schneidmiller,
M.V. Yurkov,
T. Limberg,
Adrian P. Mancuso
Publication year - 2017
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.25.017892
Subject(s) - optics , wavefront , phase retrieval , single shot , physics , focus (optics) , detector , holography , phase (matter) , laser , ptychography , diffraction , fourier transform , quantum mechanics
Determining fluctuations in focus properties is essential for many experiments at Self-Amplified-Spontaneous-Emission (SASE) based Free-Electron-Lasers (FELs), in particular for imaging single non-crystalline biological particles. We report on a diffractive imaging technique to fully characterize highly focused, single-shot pulses using an iterative phase retrieval algorithm, and benchmark it against an existing Hartmann wavefront sensor. The results, both theoretical and experimental, demonstrate the effectiveness of this technique to provide a comprehensive and convenient shot-to-shot measurement of focused-pulse wave fields and source-point positional variations without the need for manipulative optics between the focus and the detector.