Journal Article

PUBDB-2015-01020

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Measuring the temporal structure of few-femtosecond free-electron laser X-ray pulses directly in the time domain

Helml, W. ; Maier, A. R.CFEL* ; Schweinberger, W. ; Grguraš, I.CFEL* ; Radcliffe, P.XFEL* ; Doumy, G. ; Roedig, C. ; Gagnon, J. ; Messerschmidt, M.>Extern*XFEL* ; Schorb, S. ; Bostedt, C. ; Grüner, F.CFEL* ; DiMauro, L. F. ; Cubaynes, D. ; Bozek, J. D. ; Tschentscher, T.>Extern*XFEL* ; Costello, J. T. ; Meyer, M.>Extern*XFEL* ; Coffee, R. ; Duesterer, S.DESY* ; Cavalieri, A. L.CFEL* ; Kienberger, R. (Corresponding author)

2014
Nature Publ. Group London [u.a.]

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Please use a persistent id in citations: doi:10.1038/nphoton.2014.278

Abstract: Short-wavelength free-electron lasers are now well established as essential and unrivalled sources of ultrabright coherent X-ray radiation. One of the key characteristics of these intense X-ray pulses is their expected few-femtosecond duration. No measurement has succeeded so far in directly determining the temporal structure or even the duration of these ultrashort pulses in the few-femtosecond range. Here, by deploying the so-called streaking spectroscopy technique at the Linac Coherent Light Source, we demonstrate a non-invasive scheme for temporal characterization of X-ray pulses with sub-femtosecond resolution. This method is independent of photon energy, decoupled from machine parameters, and provides an upper bound on the X-ray pulse duration. We measured the duration of the shortest X-ray pulses currently available to be on average no longer than 4.4 fs. Analysing the pulse substructure indicates a small percentage of the free-electron laser pulses consisting of individual high-intensity spikes to be on the order of hundreds of attoseconds.

Note: (c) Macmillan Publishers Limited. Post referee full text in progress. Embargo full text 6 months from 24 November 2014.

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Contributing Institute(s):

1. European XFEL (Eur.XFEL)

Research Program(s):

1. XFEL In-house research / external facilities (POF2-54G17) (POF2-54G17)

Experiment(s):

1. Measurement at external facility
2. SQS: Small Quantum Systems (SASE3)

Appears in the scientific report 2014

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Database coverage:
; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 25 ; JCR ; Nationallizenz ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Thomson Reuters Master Journal List ; Web of Science Core Collection

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