Hannover 2020 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 22: Posters: Quantum Optics and Photonics II
Q 22.9: Poster
Tuesday, March 10, 2020, 16:30–18:30, Empore Lichthof
Tunable vacuum ultaviolet laser setup for first nuclear spectroscopic measurements on thorium — •Philip Mosel, Uwe Morgner, and Milutin Kovacev — Institut für Quantenoptik, Cluster of Excellence PhoenixD and QuantumFrontiers, Leibniz Universität Hannover, Welfengarten 1, 30167 Hannover
The metastable transition from the nuclear ground state to the first excited state of the thorium isotope 229Th with a calculated lifetime in the range of 10−4s [1] is a promising candidate for the realization of the first optical nuclear clock. Due to its extraordinarily low excitation energy of about 8.26 eV, corresponding to a wavelength of about 150 nm [2], it is reachable by laser systems in the vacuum ultraviolet (VUV). Here we present a laser system based on four-wave mixing in Xenon of a tunable pulsed Ti:Sapphire and its third harmonic. This scheme allows for an efficient fifth harmonic generation in the VUV (140 - 160 nm). The system provides a suitable source for the precisely determination of the transition energy by laser-based conversion electron-Mössbauer spectroscopy (CEMS) in thin layer of neutral 229Th atoms [3]. The exact knowledge of the excitation energy is crucial for laser spectroscopy of individual thorium ions in Paul traps and for the development of an optical single ion nuclear clock.
[1] N. Minkov and A. Palffy, Phys. Rev. Lett. 118, 212501 (2017).
[2] B. R. Beck et al., Phys. Rev. Lett. 98, 142501 (2007).
[3] L. von der Wense et al., Phys. Rev. Lett. 119, 132503 (2017).