Second-order autocorrelation of XUV FEL pulses via time resolved two-photon 
single ionization of He

Moshammer, R.; Pfeifer, Th.; Rudenko, A.; Jiang, Y. H.; Foucar, L.; Kurka, M.; Kühnel, K. U.; Schröter, C. D.; Ullrich, J.; Herrwerth, O.; Kling, M. F.; Liu, X.-J.; Motomura, K.; Fukuzawa, H.; Yamada, A.; Ueda, K.; Ishikawa, K. L.; Nagaya, K.; Iwayama, H.; Sugishima, A.; Mizoguchi, Y.; Yase, S.; Yao, M.; Saito, N.; Belkacem, A.; Nagasono, M.; Higashiya, A.; Yabashi, M.; Ishikawa, T.; Ohashi, H.; Kimura, H.; Togashi, T.

doi:10.1364/OE.19.021698

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Second-order autocorrelation of XUV FEL pulses via time resolved two-photon single ionization of He

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Foucar, L.
Department of Biomolecular Mechanisms, Max Planck Institute for Medical Research, Max Planck Society;

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http://dx.doi.org/10.1364/OE.19.021698
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Citation

Moshammer, R., Pfeifer, T., Rudenko, A., Jiang, Y. H., Foucar, L., Kurka, M., et al. (2011). Second-order autocorrelation of XUV FEL pulses via time resolved two-photon single ionization of He. Optics Express, 19(22), 21698-21706. doi:10.1364/OE.19.021698.

Cite as: https://hdl.handle.net/11858/00-001M-0000-0019-CD88-C

Abstract

Second-order autocorrelation spectra of XUV free-electron laser pulses from the Spring-8 Compact SASE Source (SCSS) have been recorded by time and momentum resolved detection of two-photon single ionization of He at 20.45 eV using a split-mirror delay-stage in combination with high-resolution recoil-ion momentum spectroscopy (COLTRIMS). From the autocorrelation trace we extract a coherence time of 8 ± 2 fs and a mean pulse duration of 28 ± 5 fs, much shorter than estimations based on electron bunch-length measurements. Simulations within the partial coherence model [Opt. Lett. 35, 3441 (2010)] are in agreement with experiment if a pulse-front tilt across the FEL beam diameter is taken into account that leads to a temporal shift of about 6 fs between both pulse replicas