SAMOP 2021 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 2: Precision spectroscopy of atoms and ions (joint session A/Q)

A 2.9: Poster

Montag, 20. September 2021, 16:30–18:30, P

Interrogating the temporal coherence of EUV frequency combs with highly charged ions — •Chunhai Lyu, Stefano M. Cavaletto, Christoph H. Keitel, and Zoltán Harman — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

An extreme-ultraviolet (EUV) frequency comb is usually generated via intra-cavity high-order harmonic generation of an infrared (IR) frequency comb. However, whether the temporal coherence of the IR frequency comb is preserved in the corresponding EUV frequency comb is still under debate. Here, we put forward a scheme to directly infer the temporal coherence of EUV frequency combs via spectroscopy of highly charged Mg-like ions. The fluctuations of the carrier-envelope phase between EUV pulses is modelled as a random walk process. Based on numerical simulations, we show that the coherence time of the EUV frequency comb can be determined from the excitation spectrum of given ionic transitions. This scheme will provide a verification of the temporal coherence of an EUV frequency comb at timescales several orders of magnitude longer than current state of the art, and at the same time will enable high-precision spectroscopy of EUV transitions down to the 15th digit.

[1]. Phys. Rev. Lett. 98, 070801 (2020).