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MO: Fachverband Molekülphysik
MO 9: Attosecond Physics II / Interaction with VUV and X-ray light (joint session A/MO)
MO 9.6: Talk
Wednesday, March 13, 2024, 12:30–12:45, HS 1010
Angular Streaking at 1030 nm – measurement of gigawatt-power attosecond pulses at European XFEL — •Lars Funke1, Sara Savio1, Lasse Wülfing1, Niclas Wieland1, Kristina Dingel4, Torsten Otto2, Ruda Hindriksson4, Lutz Marder4, Christopher Passow2, Rebecca Boll3, Alberto De Fanis3, Simon Dold3, Tommaso Mazza3, Dirk Raiser3, Michael Meyer3, Terence Mullins3, Markus Ilchen5, and Wolfram Helml1 — 1Technische Universität Dortmund, Germany — 2Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany — 3European XFEL GmbH, Schenefeld, Germany — 4Universität Kassel, Germany — 5Universität Hamburg, Germany
Angular Streaking can be used as a method for characterizing ultrashort X-ray pulses by overlapping the pulse with a circularly polarized IR laser pulse in a gaseous target. Photoelectron momenta are shifted in a characteristic way for a given spectro-temporal X-ray pulse structure. Measuring the photoelectron energy spectra with multiple time-of-flight spectrometers allows the reconstruction of pulse structure.
A Cookiebox-type photoelectron spectrometer array was set up at the SQS instrument of European XFEL to characterize specially tuned sub-femtosecond soft X-ray FEL pulses.
In the measurement, we found intense attosecond X-ray pulses, with pulse durations on the order of 300 as and a peak power in the hundreds of gigawatts. The lower-than-planned streaking laser wavelength of 1030 nm turned out beneficial for characterizing the ultrashort pulses provided.
Keywords: angular streaking; xfel; pulse characterization