SAMOP 2023 – scientific programme
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A: Fachverband Atomphysik
A 12: Poster I
A 12.5: Poster
Tuesday, March 7, 2023, 16:30–19:00, Empore Lichthof
Investigation of ultrashort FEL pulses utilizing the split-and-delay unit at FLASH2 — •Matthias Dreimann1, Evgeny Schneidmiller3, Dennis Eckermann1, Frank Wahlert2, Sebastian Roling2, Michael Wöstmann1, Victor Kärcher1, Tobias Reiker1, Marion Kuhlmann3, Sven Toleikis3, Rolf Treusch3, Elke Plönjes-Palm3, and Helmut Zacharias1 — 1Center for Soft Nanoscience, Westfälische Wilhelms-Universität Münster — 2Physikalisches Institut, Westfälische Wilhelms-Universität Münster — 3Deutsches Elektronen-Synchrotron DESY
A split-and-delay unit for the XUV and soft X-ray spectral range has been installed at beamlines FL23 and FL24 at the FLASH2 Free-Electron Laser at DESY. It enables time-resolved pump-probe experiments from 30 eV up to 1800 eV including the whole spectral range of FLASH2. Using wavefront beam splitting and grazing incidence mirrors a relative pulse delay of -5 ps < Δτ < +18 ps is achieved. With a measured timing jitter of tj = 121 as and a nominal time resolution of tr = 66 as a sub-fs resolution of this device enables time-resolved experiments with ultrashort FEL pulses. The development of ultrashort FEL pulses with few-fs and sub-fs pulses is a research field in the FEL community with promising applications. One of theses applications are pump/probe experiments with ultrashort FEL pulses, as the temporal dynamic of the system is a key to the fundamental understanding of its underlying physics. We present first results of the investigation of ultrashort FEL pulses which in future will allow sub-fs temporal resolution in experiments.