2019/11/04 by Björn Senfftleben, Martin Kretschmar, Senfftleben, Björn +17 · 2 citations
Physics and Astronomy · #Atomic Physics (physics.atom-ph) #Atomic and Molecular Physics #FOS: Physical sciences #Laser-Matter Interactions and Applications #Laser-Plasma Interactions and Diagnostics #Optics (physics.optics)
paper · pdf · doi:10.48550/arxiv.1911.01375
openalex publication_date 2019/11/04 · openalex created_date 2022/07/26 · openalex updated_date 2026/07/28
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 (\≈ 10 mJ) pulse energy. We demonstrate our approach by\nionizing Ar atoms up to Ar5+, requiring the absorption of at least 10 XUV\nphotons.\n