Freiburg 2024 – scientific programme
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A: Fachverband Atomphysik
A 33: Poster VI
A 33.12: Poster
Thursday, March 14, 2024, 17:00–19:00, Tent A
XUV Frequency Comb driven Velocity Map Imaging of Argon — •Nick Lackmann1, Jan-Hendrik Oelmann1, Tobias Heldt1, Lennart Guth1, Janko Nauta2, Thomas Pfeifer1, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2Swansea University, UK
Atomic clocks offer potential for fundamental physics studies due to their remarkable precision [1,2]. Opting for clock transitions in the extreme ultraviolet (XUV) not only increases achievable precision but also facilitates spectroscopy on systems such as highly charged ions and the thorium-229m nuclear transition. To realize this, an extreme-ultraviolet frequency comb was constructed using cavity-enhanced high-harmonic generation, driven by a 100 MHz near-infrared frequency comb [3]. This approach generates harmonics up to 42 eV. The resulting harmonics are employed in a resonant ionization protocol, where the comb excites the transition of interest, followed by ionization with a narrow NIR laser. The electron momenta are captured using the velocity map imaging technique to simultaneously record multiple transitions.
[1] M. G. Kozlov et al., Rev. Mod. Phys. 90, 045005 (2018)
[2] Safronova et al., Phys. Rev. Lett. 113, 030801 (2014)
[3] J. Nauta et al., Opt. Express 29, 2624 - 2636 (2021)
Keywords: XUV Frequency Comb; Velocity Map Imaging; Precision Spectroscopy; High Harmonic Generation