title: Wigner distribution measurements of the spatial coherence properties of the free-electron laser FLASH.
abstract: The four-dimensional Wigner distribution function is determined from intensity profiles measured in the focused photon beam of FLASH (Free-electron laser in Hamburg) for a variety of photon beamline settings. The Wigner formalism results in comprehensive coherence information without the requirement of simplifying assumptions on the beam. The entire four-dimensional spatial mutual coherence function, horizontal and vertical coherence lengths and the global degree of coherence are derived and compared to Young's double pinhole measurements [Opt. Express 20, 17480 (2012)].
authors: Tobias
authors: T
authors: Mey
authors: Bernd
authors: B
authors: Schäfer
authors: Klaus
authors: K
authors: Mann
authors: Barbara
authors: B
authors: Keitel
authors: Marion
authors: M
authors: Kuhlmann
authors: Elke
authors: E
authors: Plönjes