SAMOP 2023 – scientific programme

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A: Fachverband Atomphysik

A 20: Poster II

A 20.31: Poster

Wednesday, March 8, 2023, 16:30–19:00, Empore Lichthof

Closed-cycle noble gas recycling system for an extreme-ultraviolet frequency comb — •Nele Griesbach, Jan-Hendrik Oelmann, Lennart Guth, Tobias Heldt, Roman Hector, Nick Lackmann, Janko Nauta, Thomas Pfeifer, and José R. López-Urrutia — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg

To perform ultra-high spectroscopy of highly charged ions in the extreme ultraviolet (XUV), we developed an XUV-frequency comb [1]. Focusing the fundamental comb into a gas jet, high harmonic generation converts the near-infrared spectrum into the XUV regime. Usually, noble gases such as xenon, neon or krypton are used because of their high ionization potentials. As the worldwide demand for noble gases is increasing strongly and the abundancy of most noble gases in air is very low, the costs have increased to a point where long-term experiments are impossible. Therefore, we have developed a gas recycling system. The gas is injected through a 30 µm nozzle into the laser focus and is collected by a differential pumping system [1] to maintain the vacuum and is then re-compressed to a pressure of up to 200 bar. A good vacuum with low contamination level is indispensable as the cavity mirrors are susceptible to degradation and XUV light is strongly absorbed by air. We present the technical design of the system as well as measurements of the leakage and contamination rates.

[1] J. Nauta, An extreme-ultraviolet frequency comb enabling frequency metrology with highly charged ions, Phd thesis, Universität Heidelberg (2020).