Freiburg 2024 – scientific programme

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A: Fachverband Atomphysik

A 43: Ultrafast Dynamics III and High-harmonic Generation (joint session MO/A)

A 43.5: Talk

Friday, March 15, 2024, 15:30–15:45, HS 3044

Automatic optimization of intense high-harmonic pulses — •José Gómez Torres, Frederic Ussling, Simon Wächter, Alessandro Colombo, Linos Hecht, Katharina Kolatzki, Alexandre Rosillo Vorsin, Mario Sauppe, and Daniela Rupp — ETH Zurich, Laboratory for Solid State Physics, John-von-Neumann-Weg 9, 8093 Zurich, Switzerland

High harmonic generation (HHG) allows the production of extreme ultraviolet pulses ranging from picosecond up to attosecond timescales from intense infrared (IR) pulses, making it an invaluable tool for the study of ultrafast phenomena. It has been recently demonstrated that HHG is capable of producing pulses intense enough for diffraction experiments like coherent diffraction imaging of isolated nanoparticles [1]. Very intense pulses of short time duration in a stable delivery over hours are necessary for this, requiring a time-consuming optimization of the experimental parameters. We developed a tool for the automatic optimization of HHG parameters, sweeping different geometric parameters of the setup and measuring for each step the pulse energy achieved. Due to the complexity of simulating the specific conditions of the experiment, this trial and error approach is a necessary final step to achieve the highest pulse energy. In order to optimize the XUV peak focal intensity, we perform electron spectroscopy on a diffuse gas in the focus region. Via IR-XUV pump probe, RABBITT measurements can be carried out for the temporal characterization of pulses.

[1] D. Rupp et al., Nature Communication 8, 493 (2017)

Keywords: High harmonic generation; Coherent diffraction imaging; Cluster; Ultrafast science; XUV