2019•arXiv (Cornell University)Open access
Highly nonlinear ionization of atoms induced by intense high-harmonic\n pulses
Björn Senfftleben, Martin Kretschmar, Andreas Hoffmann, Mario Sauppe, J. Tümmler, I. Will, Tamás Nagy, Marc J. J. Vrakking, Daniela Rupp, Bernd Schütte
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Abstract
Intense extreme-ultraviolet (XUV) pulses enable the investigation of\nXUV-induced nonlinear processes and are a prerequisite for the development of\nattosecond pump - attosecond probe experiments. While highly nonlinear\nprocesses in the XUV range have been studied at free-electron lasers (FELs),\nhigh-harmonic generation (HHG) has allowed the investigation of low-order\nnonlinear processes. Here we suggest a concept to optimize the HHG intensity,\nwhich surprisingly requires a scaling of the experimental parameters that\ndiffers substantially from optimizing the HHG pulse energy. As a result, we are\nable to study highly nonlinear processes in the XUV range using a driving laser\nwith a modest ($\\approx 10$ mJ) pulse energy. We demonstrate our approach by\nionizing Ar atoms up to Ar$^{5+}$, requiring the absorption of at least 10 XUV\nphotons.\n
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