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A: Fachverband Atomphysik
A 6: Attosecond Physics I (joint session A/MO)
A 6.4: Vortrag
Dienstag, 11. März 2025, 12:00–12:15, GrHS Mathe
In silico approach for understanding experimental sub-cycle driven high harmonic generation from XUV to soft X-rays. — •Rafael de Q. Garcia1,2, Maximilian Kubullek1,2, Miguel Silva1,2, Roland E. Mainz1,2,3, Fabian Scheiba1,2,3, Giulio M. Rossi1,3, and Franz X. Kärtner1,2,3 — 1Center for Free-Electron Laser Science CFEL and Deutsches Elektronen-Synchrotron DESY, Notkestraße 85, 22607 Hamburg, Germany — 2Physics Department, University of Hamburg, Luruper Chaussee 149, 22761 Hamburg, Germany — 3The Hamburg Centre for Ultrafast Imaging, Luruper Chaussee 149, 22761 Hamburg, Germany
High harmonic generation (HHG) has since long been used for generating tabletop XUV to soft X-ray isolated attosecond pulses used for ultrafast science. However, as the pulses driving HHG get shorter, achieving even sub-cycle duration, new challenges are faced both experimentally and theoretically to understand which electric field is producing HHG and how phase-matching of HHG actually happens in a medium. To answer these questions, we combine an in situ pulse characterization technique with a 1D optical and HHG-field propagation code. With these two tools, we simulate the outcomes of an experiment performed with our parametric waveform synthesizer, which drives HHG with either few-cycle or synthesized sub-cycle pulses, under different macroscopic conditions. It is shown, that this method enables qualitative and quantitative agreement between experiment and simulation, answering fundamental questions about sub-cycle driven HHG such as efficiency increase and plasma propagation effects.
Keywords: sub-cycle pulses; two-color HHG; Simulation; High harmonic Generation; water window