Bonn 2025 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 24: Poster – Interaction with VUV and X-ray light
A 24.3: Poster
Mittwoch, 12. März 2025, 17:00–19:00, Tent
Nuclear excitation in 229Th using Laguerre-Gauss beams — •Alexander Franz, •Janek Bergmeier, Tobias Kirschbaum, and Adriana Pálffy — Julius-Maximilians-Universität Würzburg, Am Hubland, 97074 Würzburg, Germany
Twisted light refers to light carrying orbital angular momentum along its direction of propagation. In combination with its spatially inhomogeneous intensity profile, this form of light has been studied in relation to atom-light interaction. As one application, twisted light can be used in quantum metrology to minimize the unwanted light shift in atomic clock transitions [1]. A promising alternative to atomic clocks is a clock based on the 229Th nucleus and its unique 8.4 eV transition [2]. It is thus intriguing to investigate the interaction of thorium with twisted light.
In a first attempt we have described Bessel beams interacting with 229Th for solid-state and ion targets [3]. Here, we build upon that work by considering more realistic Laguerre-Gauss beams. Two aspects are investigated. First, we address the temporal excitation dynamics of a single ion as a function of impact parameter. Second, we model the propagation dynamics and investigate the case of two-pulse driving in a Λ coupling scheme [4]. Thereby we focus on the effects of a Laguerre-Gauss control beam.
[1] R. Lange et al., Phys. Rev. Lett. 129, 253901 (2022).
[2] C.Zhang et al., Nature 633, 63-70 (2024).
[3] T. Kirschbaum et al., arXiv: 2404.13023 (2024).
[4] H. R. Hamedi et al., Opt. Lett. 46, 17, pp.4204-4207 (2021).
Keywords: Nuclear clock; Twisted light; VUV light