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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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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: http://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