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Title: Spatio-temporal coherence of free-electron laser radiation in the extreme ultraviolet determined by a Michelson interferometer

A key feature of extreme ultraviolet (XUV) radiation from free-electron lasers (FELs) is its spatial and temporal coherence. We measured the spatio-temporal coherence properties of monochromatized FEL pulses at 13.5 nm using a Michelson interferometer. A temporal coherence time of (59±8) fs has been determined, which is in good agreement with the spectral bandwidth given by the monochromator. Moreover, the spatial coherence in vertical direction amounts to about 15% of the beam diameter and about 12% in horizontal direction. The feasibility of measuring spatio-temporal coherence properties of XUV FEL radiation using interferometric techniques advances machine operation and experimental studies significantly.
Authors:
; ;  [1] ; ; ; ; ; ; ;  [2] ; ;  [3] ;  [4] ;  [1] ;  [5] ; ;  [6] ;  [7] ; ; more »;  [8] ; « less
  1. Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena (Germany)
  2. Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg (Germany)
  3. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550 (United States)
  4. Department of Physics, University of California, Berkeley, California 94720 (United States)
  5. (Germany)
  6. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States)
  7. Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom)
  8. Institut für Physik, Universität Rostock, 18051 Rostock (Germany)
Publication Date:
OSTI Identifier:
22310812
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; COHERENT RADIATION; EXTREME ULTRAVIOLET RADIATION; FREE ELECTRON LASERS; MICHELSON INTERFEROMETER; OPERATION; PULSES