Dresden 2020 – scientific programme

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KFM: Fachverband Kristalline Festkörper und deren Mikrostruktur

KFM 5: Microscopy and Spectroscopy with X-rays, Ions and Positrons (joint session KFM/CPP)

KFM 5.1: Talk

Monday, March 16, 2020, 15:00–15:20, TOE 317

Single-Shot Phase-Contrast Microscopy of Laser-induced Cavitation at MID/EuXFEL — •Johannes Hagemann¹, Malte Vassholz², Hannes Höppe², Markus Osterhoff², Juan Rosello³, Robert Mettin³, Andreas Schropp¹, Christian Schroer^{1, 4}, and Tim Salditt² — ¹DESY, Notkestraße 85, 22607 Hamburg — ²Institut für Röntgenphysik, Friedrich-Hund-Platz 1, 37077 Göttingen — ³Drittes Physikalisches Institut, Friedrich-Hund-Platz 1, 37077 Göttingen — ⁴Department Physik, Universität Hamburg,Luruper Chaussee 149, 22761 Hamburg

X-ray free electron lasers offer unique opportunities for imaging of ultra-fast processes on smallest length-scales paired with the penetration power of hard X-rays. One of these processes is laser-induced cavitation in water. The dynamic nature of the processes under study is incompatible to scanning schemes for image acquisition thus we chose propagation-based near-field imaging as full-field imaging scheme. The illumination with high intensity, fs-short X-ray pulses enables imaging with single pulses which yield a still image of the cavitation bubble without motion blur. In this contribution we will present a pump-probe imaging experiment conducted at the MID instrument at the European XFEL. The experiment has been carried out at 14/17.8 keV photon energy. The X-rays have been focused by aberration corrected Be-compound refractive lenses down to 100 nm focus-size. The fluctuating nature of the SASE-process poses some challenges for the data analysis. We present our approach to the data-processing, phase-retrieval and results.