SAMOP 2023 – scientific programme
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A: Fachverband Atomphysik
A 24: Interaction with Strong or Short Laser Pulses III (joint session A/MO)
A 24.1: Invited Talk
Thursday, March 9, 2023, 14:30–15:00, F107
Intra-cavity photoelectron tomography with an intra-cavity velocity-map imaging spectrometer at 100 MHz repetition rate — •Jan-Hendrik Oelmann1, Tobias Heldt1, Lennart Guth1, Janko Nauta1,2, Nick Lackmann1, Valentin Wössner1, Stepan Kokh1, Thomas Pfeifer1, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Current address: Department of Physics, Swansea University, Singleton Park, SA2, United Kingdom
In a first experiment, we used intra-cavity velocity-map imaging (VMI) at 100 MHz repetition rate to investigate multi-photon ionization (MPI) events of xenon with high count rates, even at very low intensities [1]. For that, ultrashort pulses from a near-infrared frequency comb laser were amplified in a passive femtosecond enhancement cavity that we now use for extreme-ultraviolet frequency comb generation [2].
For tomographic reconstruction of photoelectron angular distributions (PADs) [3], we developed a compact VMI spectrometer and a polarization-insensitive enhancement cavity [4]. We will present our new setup that collects electron-energy spectra at high rates and allows to tomographically reconstruct 3D PADs from intra-cavity xenon MPI.
[1] J. Nauta et al., Opt. Lett. 45(8), 2156 (2020). [2] J. Nauta et al., Opt. Exp. 29(2), 2624 (2021). [3] M. Wollenhaupt et al., Appl. Phys. B 95(4), 647-651 (2009). [4] J.-H. Oelmann et al., Rev. Sci. Instrum., accepted (2022).