title: Coherence properties of individual femtosecond pulses of an x-ray free-electron laser.
abstract: Measurements of the spatial and temporal coherence of single, femtosecond x-ray pulses generated by the first hard x-ray free-electron laser, the Linac Coherent Light Source, are presented. Single-shot measurements were performed at 780 eV x-ray photon energy using apertures containing double pinholes in "diffract-and-destroy" mode. We determined a coherence length of 17  μm in the vertical direction, which is approximately the size of the focused Linac Coherent Light Source beam in the same direction. The analysis of the diffraction patterns produced by the pinholes with the largest separation yields an estimate of the temporal coherence time of 0.55 fs. We find that the total degree of transverse coherence is 56% and that the x-ray pulses are adequately described by two transverse coherent modes in each direction. This leads us to the conclusion that 78% of the total power is contained in the dominant mode.
authors: Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, D-22607 Hamburg, Germany. Ivan.Vartaniants@desy.de
authors: I A
authors: IA
authors: Vartanyants
authors: A
authors: A
authors: Singer
authors: A P
authors: AP
authors: Mancuso
authors: O M
authors: OM
authors: Yefanov
authors: A
authors: A
authors: Sakdinawat
authors: Y
authors: Y
authors: Liu
authors: E
authors: E
authors: Bang
authors: G J
authors: GJ
authors: Williams
authors: G
authors: G
authors: Cadenazzi
authors: B
authors: B
authors: Abbey
authors: H
authors: H
authors: Sinn
authors: D
authors: D
authors: Attwood
authors: K A
authors: KA
authors: Nugent
authors: E
authors: E
authors: Weckert
authors: T
authors: T
authors: Wang
authors: D
authors: D
authors: Zhu
authors: B
authors: B
authors: Wu
authors: C
authors: C
authors: Graves
authors: A
authors: A
authors: Scherz
authors: J J
authors: JJ
authors: Turner
authors: W F
authors: WF
authors: Schlotter
authors: M
authors: M
authors: Messerschmidt
authors: J
authors: J
authors: Lüning
authors: Y
authors: Y
authors: Acremann
authors: P
authors: P
authors: Heimann
authors: D C
authors: DC
authors: Mancini
authors: V
authors: V
authors: Joshi
authors: J
authors: J
authors: Krzywinski
authors: R
authors: R
authors: Soufli
authors: M
authors: M
authors: Fernandez-Perea
authors: S
authors: S
authors: Hau-Riege
authors: A G
authors: AG
authors: Peele
authors: Y
authors: Y
authors: Feng
authors: O
authors: O
authors: Krupin
authors: S
authors: S
authors: Moeller
authors: W
authors: W
authors: Wurth