SAMOP 2023 – scientific programme
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A: Fachverband Atomphysik
A 27: Poster III
A 27.17: Poster
Thursday, March 9, 2023, 16:30–19:00, Empore Lichthof
XUV frequency comb for precision spectroscopy of trapped highly charged ions — •Lennart Guth1, Jan-Hendrik Oelmann1, Tobias Heldt1, Janko Nauta1,2, Nick Lackmann1, Nele Griesbach1, Thomas Pfeifer1, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institute for Nuclear Physics, Heidelberg, Germany — 2Department of Physics, Swansea University, Singleton Park, SA2, United Kingdom
Highly charged ions have a few tightly bound electrons, which allow to probe fundamental physics and develop new frequency standards. However, most transitions are in the extreme ultraviolet (XUV)[1]. To perform spectroscopy on these with unprecedented precision, we have built an XUV frequency comb by transferring the coherence and stability of a near-infrared (NIR) frequency comb to the XUV using high-harmonic generation [2]. To reach the required peak intensity, NIR frequency comb pulses (200 fs) are amplified to 80 W in a chirped pulse fiber amplifier and resonantly overlapped in a femtosecond enhancement cavity (Pavg ≈ 25 kW, Ipeak≈ 3·1014 W/cm2) [3]. High harmonics up to the 35th order are coupled out of the cavity and will be used for future direct XUV spectroscopy of highly charged ions, trapped and sympathetically cooled in a superconducting Paul trap [4].
[1] M.S. Safronova et al., Phys. Rev. Lett. 113, 030801 (2014).
[2] G. Porat et al., Nat. Photon, 12, 387 - 391 (2018).
[3] J. Nauta et al., Nucl. Instrum. Meth. B 408, 285 (2017).
[4] J. Stark et al., Rev. Sci. Instrum., 92, 083203 (2021).