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Q: Fachverband Quantenoptik und Photonik

Q 52: Nuclear Clocks

Q 52.1: Hauptvortrag

Donnerstag, 13. März 2025, 11:00–11:30, HS Botanik

Recent progress towards the development of a ²²⁹Th-based nuclear optical clock — •Lars von der Wense — Johannes Gutenberg-Universität Mainz

The development of a nuclear optical clock based on spectroscopy of the first nuclear excited state of the ²²⁹Th isotope has long been in the scientific focus^[1]. Significant progress has been made in the year 2024, when three independent research groups reported success in laser spectroscopy of this previoulsy elusive nuclear state^[2,3,4]. In this talk, I will provide a review of the recent developments in the field, with a special focus on the JILA experiment^[4], where direct frequency comb spectroscopy of the transition was achieved. In addition, I will provide an overview on the activities underway at the University of Mainz, where we are investigating the options for cw laser spectroscopy of the nuclear transition based on light generated via quasi-phase matching in BaMgF₄.

[1] L. von der Wense et al., Eur.Phys.J. A, 56:277 (2020).

[2] J. Tiedau et al., PRL 132, 182501 (2024).

[3] R. Elwell et al., PRL 133, 013201 (2024).

[4] C. Zhang et al., Nature 633, 63 (2024).

This work is supported by the BMBF Quantum Futur II Grant Project "NuQuant" (FKZ 13N16295A).

Keywords: nuclear clock; thorium-229; laser spectroscopy; frequency comb; laser development