Continuous-wave laser source at the 148 nm nuclear transition of Th-229
Optics
2025-12-23 v1
Abstract
A continuous-wave laser source at 148.4 nm based on second-harmonic generation in randomly quasi-phase matched strontium tetraborate, SrB4O7, is demonstrated. It provides (1.3-0.6+0.7) nW of VUV power in a single pass for an incident UV laser power of 325 mW. The laser system is developed for the resonant laser excitation of the 229Th nucleus to its low-energy isomeric state. For a frequency-stabilized laser system we expect to reach similar VUV power spectral densities as in previous pulsed laser excitation experiments of the nuclear transition in 229Th-doped crystals.
Keywords
Cite
@article{arxiv.2507.17719,
title = {Continuous-wave laser source at the 148 nm nuclear transition of Th-229},
author = {Vishal Lal and Maksim V. Okhapkin and Johannes Tiedau and Niels Irwin and Valentin Petrov and Ekkehard Peik},
journal= {arXiv preprint arXiv:2507.17719},
year = {2025}
}
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5 pages