Journal
OPTICS EXPRESS
Volume 21, Issue 21, Pages 24647-24664Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.21.024647
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Funding
- U.S. Department of Energy's Office of Basic Energy Sciences
- DoE
- U.S. Department of Energy, Office of Basic Energy Sciences, Division of Materials Sciences and Engineering
- Converging Research Center Program through the Ministry of Science, ICT and Future Planning, Korea [2013K000307]
- Deutsche Forschungsgemeinschaft
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The single shot based coherence properties of hard x-ray pulses from the Linac Coherent Light Source (LCLS) were measured by analyzing coherent diffraction patterns from nano-particles and gold nanopowder. The intensity histogram of the small angle x-ray scattering ring from nano-particles reveals the fully transversely coherent nature of the LCLS beam with a number of transverse mode < M-s > = 1.1. On the other hand, the speckle contrasts measured at a large wavevector yields information about the longitudinal coherence of the LCLS radiation after a silicon (111) monochromator. The quantitative agreement between our data and the simulation confirms a mean coherence time of 2.2 fs and a x-ray pulse duration of 29 fs. Finally the observed reduction of the speckle contrast generated by x-rays with pulse duration longer than 30 fs indicates ultrafast dynamics taking place at an atomic length scale prior to the permanent sample damage. (C) 2013 Optical Society of America
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