Freiburg 2024 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 9: Attosecond Physics II / Interaction with VUV and X-ray light (joint session A/MO)
MO 9.4: Vortrag
Mittwoch, 13. März 2024, 12:00–12:15, HS 1010
Driving the high harmonic process using a multi-pass cell — •Benjamin Steiner1, Dominik Ertel1, Dennis Groschupf1, Anne-Lise Viotti2, Mario Niebuhr1, Barbara Merzuk1, David Busto1,2, Ioannis Makos1, and Giuseppe Sansone1 — 1Institute of Physics, University of Freiburg, Freiburg, Germany — 2Division of Atomic Physics, Lund University, Sweden
The investigation of electronic-correlation driven processes, such as the Auger decay in krypton [1] or single-photon double-ionisation in helium [2], requires photon energies of 100 eV or higher. Using electron-electron-ion coincidence and attosecond pulses in the XUV spectral range obtained by high-order harmonic generation (HHG), these processes can be resolved in time in a pump-probe scheme. The first challenge is to demonstrate an attosecond source operating at high repetition rates (>50kHz) characterised by a cut-off energy well above 100 eV. For this purpose, we developed a temporal pulse compression scheme based on a gas-filled multi-pass cell for high-power throughput driven by a commercially available Yb-based laser system. The achieved pulses lead to high enough peak intensities for driving the HHG process in neon efficiently, maintaining a sufficient photon flux in the desired energy range. The generated attosecond XUV pulses will then be employed in the already existing attosecond coincidence spectrometer in Freiburg [3] for time-resolved investigations of electron dynamics occurring during the above-mentioned processes.
[1] M. Drescher et al, Nature, 419 (2002) [2] C. Ott et al, Nature, 516 (2014) [3] D. Ertel et al, Rev. Sci. Instrum. 94, 073001(2023)
Keywords: Multi-pass cell; HHG; Single-photon double-ionisation; Coincidence spectrometer