Characterization of soft X-ray FEL pulse duration with two-color photoelectron spectroscopy

The pulse duration of soft X-ray free-electron laser (FEL) pulses of SACLA BL1 (0.2 – 0.3   nC per bunch, 0.5 – 0.8   MeV) were characterized by photoelectron sideband measurements. The intensity of the He 1   s − 1 photoelectron sidebands generated by a near-infrared femtosecond laser was measured as a function of the time delay between the two pulses using an arrival time monitor. From the width of the cross-correlation trace thus derived, the FEL pulse duration was evaluated to be 28 ± 5   fs full width at half-maximum in the photon energy range between 40   eV and 120   eV.

Source: Journal of Synchrotron Radiation - August 5, 2020 Category: Physics Authors: Owada, S. Fushitani, M. Matsuda, A. Fujise, H. Sasaki, Y. Hikosaka, Y. Hishikawa, A. Yabashi, M. Tags: free-electron lasers cross-correlation photoelectron sidebands short communications Source Type: research