Timing methodologies and studies at the FERMI free-electron laser

Time-resolved investigations have begun a new era of chemistry and physics, enabling the monitoring in real time of the dynamics of chemical reactions and matter. Induced transient optical absorption is a basic ultrafast electronic effect, originated by a partial depletion of the valence band, that can be triggered by exposing insulators and semiconductors to sub-picosecond extreme-ultraviolet pulses. Besides its scientific and fundamental implications, this process is very important as it is routinely applied in free-electron laser (FEL) facilities to achieve the temporal superposition between FEL and optical laser pulses with tens of femtoseconds accuracy. Here, a set of methodologies developed at the FERMI facility based on ultrafast effects in condensed materials and employed to effectively determine the FEL/laser cross correlation are presented.

Source: Journal of Synchrotron Radiation - December 19, 2017 Category: Physics Authors: Mincigrucci, R. Bencivenga, F. Principi, E. Capotondi, F. Foglia, L. Naumenko, D. Simoncig, A. Dal Zilio, S. Gessini, A. Kurdi, G. Mahne, N. Manfredda, M. Matruglio, A. Nikolov, I. Pedersoli, E. Raimondi, L. Sergo, R. Zangrando, M. Masciovecchio, C. Tags: cross correlation timing FEL diagnostics pump – probe research papers Source Type: research