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Q: Fachverband Quantenoptik und Photonik

Q 72: Precision Spectroscopy of Atoms and Ions V (joint session A/Q)

Q 72.2: Vortrag

Freitag, 10. März 2023, 14:45–15:00, B302

Progress toward direct frequency comb spectroscopy of ^229mTh — •Lars von der Wense¹, Chuankun Zhang², John F. Doyle², and Jun Ye² — ¹Max Planck Institute of Quantum Optics, Garching, Germany — ²JILA, University of Colorado, Boulder, USA

Laser spectroscopy of the first excited nuclear state of ²²⁹Th poses a long-standing challenge. Several groups worldwide are aiming for this goal, since success promises the development of a first nuclear optical clock of highest accuracy [1]. In this talk I will present the most recent progress of the efforts at JILA in Boulder, where direct frequency comb spectroscopy of ^229mTh is targeted [2]. For this purpose, a tunable VUV frequency comb has been developed [3] and new ²²⁹Th targets were produced. Also, planned investigations within the new NuQuant project at MPQ will be addressed.
[1] L.v.d.Wense, B.Seiferle, Eur.Phys.J.A 56:277 (2020).
[2] L.v.d.Wense, C.Zhang, Eur.Phys.J.D 74:146 (2020).
[3] C. Zhang et al., Optics Letters 47, 5591 (2022).
Supported by NSF (PHY-1734006); NIST; ARO (W911NF2010182); AFOSR (FA9550-19-1-0148); Alexander von Humboldt Foundation; BMBF (13N16295).