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

Journal Article · Mon Sep 08 00:00:00 EDT 2014 · Applied Physics Letters

DOI:https://doi.org/10.1063/1.4895455· OSTI ID:22310812

Hilbert, V.; Rödel, C.; Brenner, G.; Düsterer, S.; Dziarzhytski, S.; Harmand, M.; Przystawik, A.; Redlin, H.; Toleikis, S. ^[1]; Döppner, T.; Ma, T. ^[2]; Fletcher, L. ^[3]; Förster, E. ^[4]; Glenzer, S. H.; Lee, H. J. ^[5]; Hartley, N. J. ^[6]; Kazak, L.; Komar, D.; Skruszewicz, S. ^[7]; others, and

---

1. Deutsches Elektronen-Synchrotron DESY, Notkestrasse 85, 22607 Hamburg (Germany)
2. Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94550 (United States)
3. Department of Physics, University of California, Berkeley, California 94720 (United States)
4. Institut für Optik und Quantenelektronik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena (Germany)
5. SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025 (United States)
6. Department of Physics, Clarendon Laboratory, University of Oxford, Parks Road, Oxford OX1 3PU (United Kingdom)
7. Institut für Physik, Universität Rostock, 18051 Rostock (Germany)

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.

• OSTI ID: 22310812
• Journal Information: Applied Physics Letters, Vol. 105, Issue 10; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
COHERENT RADIATION
EXTREME ULTRAVIOLET RADIATION
FREE ELECTRON LASERS
MICHELSON INTERFEROMETER
OPERATION
PULSES