Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 13: Nuclear Clocks
Q 13.6: Vortrag
Montag, 2. März 2026, 18:15–18:30, P 11
A solid-state VUV laser at 148.4 nm for the 229mTh nuclear clock — •Keerthan Subramanian1, Nutan Kumari Sah1, Florian Zacherl1, Srinivasa Pradeep Arasada1, Valerii Andriushkov2,3, Yumiao Wang1, Ke Zhang1, Darius Fenner1, Gaurav Jha1, Jonas Stricker1,2,3, Christoph E. Düllmann1,2,3, Dmitry Budker1,2,3,4, Ferdinand Schmidt-Kaler1, and Lars von der Wense1 — 1Johannes Gutenberg Universität Mainz — 2Helmholtz Institut Mainz — 3GSI Helmholtzzentrum für Schwerionenforschung — 4University of California, Berkeley
The recent laser excitation of 229mTh has ushered in a new era with the prospect of building a nuclear clock with unprecedented stability and susceptibility to the variation of fundamental constants. A continuous-wave (cw) clock laser at 148.4 nm is indispensable for the realization of such a clockwork based 229mTh.
BaMgF4 (BMF) is a suitable candidate for second harmonic generation (SHG) due to its second order non-linearity, high VUV transparency and ferroelectric properties making it amenable to periodic poling (pp). In order to reach reasonable powers, ppBMF is placed inside an enhancement resonator and intracavity SHG is performed. The projected powers make it a viable scheme for the realization of a compact all solidstate cw laser necessary for the realization of a solid-state as well as a single-ion nuclear clock. Recent progress towards this goal will be presented. This work is supported by BMFTR Quantum Futur II Grant NuQuant under grant agreement no FKZ 13N16295A.
Keywords: Nuclear Clock; 229Th; VUV CW Laser; Second Harmonic Generation; Nuclear Laser Spectroscopy