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Q: Fachverband Quantenoptik und Photonik
Q 52: Nuclear Clocks
Q 52.2: Vortrag
Donnerstag, 13. März 2025, 11:30–11:45, HS Botanik
Towards a solid-state VUV CW Laser for the 229Th Nuclear Clock — •Keerthan Subramanian1, Nutan Kumari Sah1, Florian Zacherl1, Srinivasa Pradeep Arasada1, Valerii Andriushkov2,3, Yumiao Wang1, Ke Zhang1, Jonas Stricker1,2,3, Christoph Düllmann1,2,3, Dmitry Budker1,2,3, Ferinand Schmidt-Kaler1, and Lars von der Wense1 — 1Johannes Gutenberg Universität Mainz — 2Helmholtz Institut Mainz — 3GSI Helmholtzzentrum für Schwerionenforschung GmbH
In the entire nuclear energy landscape consisting of nearly 3300 isotopes and 176000 energy levels, 229Th is the only isotope featuring an unusually low lying isomer with an energy 8.4eV above the ground state. Recent developments have succeeded in laser exciting this 148.3 nm Vacuum UltraViolet (VUV) transition and have paved the way for the development of a nuclear clock which is expected to outperform state of the art atomic clocks. VUV radiation precludes the use of compact, commercial tunable laser sources. It also limits the number of crystals which (a) are VUV-transparent, (b) have a significant non-linear coefficient, and (c) are amenable to some form of (quasi-)phase matching. Here we present progress towards this goal of developing a compact solid-state frequency doubled Continuous Wave (CW) laser in periodically poled BaMgF4. This key technological development would enable the realization of a nuclear clock which is expected to have profound implications for tests of fundamental physics. This work is supported by BMBF Quantum Futur II Grant Project "NuQuant" (FKZ13N16295A)
Keywords: Nuclear Clock; 229Th; VUV CW Laser; Second Harmonic Generation; Nuclear laser spectroscopy