Bonn 2025 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 49: Poster – Photonics, Lasers, and Applications
Q 49.10: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Transport, alignment and focusing of a VUV laser beam for nuclear laser excitation of a single 229Th ion — •Tamila Teschler1, Georg Holthoff1, Daniel Moritz1, Kevin Scharl1, Markus Wiesinger1, Stephan Wissenberg1,2, and Peter G. Thirolf1 — 1Ludwig-Maximilians-Universität München (LMU) — 2Fraunhofer Institute for Laser Technology (ILT)
Direct frequency-comb spectroscopy represents a promising way for narrowband nuclear laser excitation. The combination of a VUV frequency comb being developed at Fraunhofer ILT and the cryogenic Paul trap operated at LMU Munich as part of an ERC Synergy project, aims to enable the excitation of the isomeric first excited state in 229Th using laser radiation with λ ≈ 148 nm. This advancement is an important step towards the realization of a nuclear clock based on the unique properties of 229Th, which could provide extraordinary precision for timekeeping and potentially offers insights into new physics beyond the Standard Model. In this device, the single-ion nuclear clock relies on the irradiation of a single, laser-cooled 229mTh3+ ion with a narrowband frequency comb. The goal is to achieve a VUV focus with a diameter of about 3 µm, to provide sufficient laser radiation intensity for driving nuclear Rabi oscillations. To achieve this, selecting the proper optical components is essential to minimize optical aberrations and power losses. Transport, alignment and focusing of a VUV laser beam from the generation site to the trapped ions will be presented. Funding: ERC Synergy project Thorium Nuclear Clock, Grant Agreement No. 856415.
Keywords: VUV radiation; Focusing on single ions; 229Th; Nuclear laser excitation; Nuclear Clock