Mainz 2026 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 27: Poster – Precision Spectroscopy of Atoms and Ions (joint session A/Q)

Q 27.28: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 1. OG

Characterization of an XUV Frequency Comb by Spectroscopy of Rydberg States — •Lennart Guth, Tobias Heldt, Anant Agarwal, Lukas Matt, Jan-Hendrik Oelmann, Nick Lackmann, Thomas Pfeifer, and José R. Crespo López-Urrutia — Max-Planck-Institut für Kernphysik, Heidelberg, Germany

We aim to use ultra-narrow transitions in highly charged ions (HCI) for novel frequency standards and fundamental physics studies. These transitions occur in the extreme ultraviolet (XUV), where narrow-bandwidth laser sources are unavailable. To address this, we built an XUV frequency comb that transfers coherence from a near-infrared (NIR) comb to the XUV via high harmonic generation (HHG) [1,2]. Using intra-cavity HHG, our system generates harmonics up to 40 eV with µW power in each order. We propose resonance-enhanced two-photon spectroscopy as a preliminary test towards spectroscopy of HCI, aiming to resolve individual teeth of our XUV comb and characterize its properties. In this approach, we excite neutral argon with one photon from a referenced 13th harmonic comb tooth to a Rydberg state, followed by ionization with a narrow-bandwidth continuous wave NIR laser. We then use velocity-map imaging to record the momentum of the released electrons, allowing us to identify the resonant Rydberg state. [1]Opt. Express 29, Issue 2, pp. 2624-2636 (2021) [2]Rev. Sci. Instrum. 95, 035115 (2024)

Keywords: high-harmonic generation; frequency comb spectroscopy; enhancement cavity; high-repetion rate; velocity-map imaging