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A: Fachverband Atomphysik
A 3: Attosecond physics / Interaction with VUV and X-ray light
A 3.2: Hauptvortrag
Dienstag, 21. September 2021, 11:15–11:45, H1
Highly nonlinear ionization of atoms induced by intense HHG pulses — Björn Senfftleben1, Martin Kretschmar1, Andreas Hoffmann1, Mario Sauppe1,2, Johannes Tümmler1, Ingo Will1, Tamás Nagy1, Marc J. J. Vrakking1, Daniela Rupp1,2, and •Bernd Schütte1 — 1Max-Born-Institut Berlin — 2ETH Zürich
High-harmonic generation (HHG) is typically considered to be a weak source of extreme-ultraviolet (XUV) photons. Here we demonstrate a very intense source of few-femtosecond XUV pulses based on HHG, reaching intensities up to 7 × 1014 W/cm2 [1]. These pulses enable us to ionize Ar atoms up to Ar5+, requiring the absorption of at least 10 XUV photons. This number can be appreciated by considering that it is similar to the number of near-infrared (NIR) photons absorbed in a typical strong-field ionization experiment.
Our results are the consequence of a novel scaling scheme, showing that the optimization of the XUV intensity requires conditions that are distinctly different from the conditions that are required to optimize the HHG pulse energy. An important advantage of our approach is that we use a moderate NIR pulse driving energy (≈ 10 mJ). Therefore, our results make it possible to perform experiments requiring intense XUV pulses in a much larger number of laboratories than is currently the case. This substantially improves the prospects for nonlinear XUV optics experiments, single-shot coherent diffractive imaging of isolated nanotargets as well as attosecond-pump attosecond-probe experiments.
[1] B. Senfftleben et al., arXiv:1911.01375