Regensburg 2022 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 68: Focus Session: Time-Resolved Momentum Microscopy

O 68.9: Vortrag

Donnerstag, 8. September 2022, 18:00–18:15, H3

Developing a fs-XUV source for time-resolved momentum microscopy on 2D materials — •Karl Schiller¹, Alan Omar², Lasse Sternemann¹, Matija Stupar¹, Clara Saraceno², and Mirko Cinchetti¹ — ¹Department of Physics, TU Dortmund University, Germany — ²Ruhr-Universität Bochum, Germany

We introduce a newly developed setup for time-resolved momentum microscopy with femtosecond extreme ultraviolet (fs-XUV) radiation. The fs-XUV pulses with photon energy up to 30 eV are generated by high-harmonic generation in an Argon gas jet and are coupled to an energy-filtered momentum microscope (KREIOS MM, Specs GmbH). A commercial Ytterbium-based high-power laser system drives the generation with a variable high repetition rate between 100 kHz and 1 MHz (Carbide, Light Conversion). While this configuration allows for high energy resolution of 50 meV, a high temporal resolution can also be reached by coupling the laser to a tunable in-house build Herriot-type multipass cell compressor with peak powers up to 2 GW and pulse durations of ∼ 45 fs [1]. In the talk, we will present the first characterization data of this setup and motivate its capability to examine few-layer 2D materials.

[1] A. Omar, et al. Advanced Solid State Lasers, OSA Technical Digest (Optical Society of America, 2021), paper JM3A.55