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A: Fachverband Atomphysik
A 39: Poster – Precision Measurement (joint session Q/A)
A 39.13: Poster
Donnerstag, 5. März 2026, 17:00–19:00, Philo 2. OG
Frequency-Comb Induced Excitation of 229Th in a Crystalline Environment — •Chiara Brüggemann, Tobias Kirschbaum, and Adriana Pálffy — Julius-Maximilians-Universität Würzburg
Large band gap crystals such as CaF2 or LiCaAlF6 serve as an ideal host for doping 229Th. This procedure leads to the formation of additional electronic defect states in the band gap. Various works have shown that these states can be used to excite the nuclear ground state population via laser-assisted Electronic Bridge (EB) schemes [1-3]. The EB rate for the 229Th isomeric transition can be calculated using a perturbative approach [3].
In this work, we theoretically investigate EB excitation assisted by optical frequency combs. The latter open new avenues for EB excitation mechanisms using two photon-schemes, as their discrete line spectrum provides ideal conditions for delivering resonant photon pairs. Our approach based on Ref. [3] includes realistic crystal lattice effects, in particular inhomogeneous broadening of the electronic defect states.
[1] B. Nickerson et al., Phys. Rev. Lett. 125, 032501 (2020)
[2] B. Nickerson et al. Phys. Rev. A 103, 053120 (2021)
[3] T. Kirschbaum et al. arXiv:2507.05070 (2025)
Keywords: Thorium Clock; Solid State Clock; Electronic Bridge; Frequency Comb