FisMat2017 - Submission - View

Abstract's title: New methodologies and tools to superpose IR and free electron laser beams
Submitting author: Riccardo Mincigrucci
Affiliation: elettra Sincrotrone trieste
Affiliation Address: Basovizza S.S. 14 Km 163.5, Trieste 34149, Italy
Country: Italy
Oral presentation/Poster (Author's request): Poster
Other authors and affiliations: F. Bencivenga (1), L. Foglia (1), A. Gessini (1), G. Kurdi (1), E. Principi (1), A. Simoncig (1), C. Masciovecchio (1) 1) Elettra Sincrotrone Trieste, Area Science Park Basovizza S.S. 14 Km 163.5, Trieste 34149, Italy

Free-electron lasers (FELs) currently represent a step forward on time-resolved investigations on any phase of matter through pump-probe methods involving FELs and laser beams. The investigated physics is wide and ranges from purely electronic dynamics, magnetics dynamics and acoustic dynamics, to cite only a few. That class of experiments requires an accurate spatial and temporal superposition of pump and probe beams on the sample. More efficient approaches are demanded to quickly achieve the superposition and synchronization of the beams. Here, we present a two novel techniques tailored to meet the focal spot characteristics of EIS-TIMEX and EIS-TIMER end-stations located at the Italian FEL FERMI. The first technique is based on an integrated device allowing the simultaneous characterization and the fast spatial and temporal overlapping of the beams. Instead, the second presented methodology relies on a damage crater created by the FEL itself which scatters the optical beam. The transient scattering intensity is employed as timing tool. Despite its simplicity, this technique permits to achieve an excellent contrast in the measurement.