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Articles by J. Tiedau
A thorium-229 optical nuclear clock with feedback loop
Abstract The laser-accessible nuclear transition in the thorium-229 isotope has been identified as a candidate for realizing an optical nuclear clock1 that might outperform current optical clocks based on electron-shell transitions in atoms or ions2. It is expected to be more robust against external perturbations3,4 and to provide enhanced sensitivity in clock-based tests of the fundamental principles of physics5,6.
Continuous-wave laser absorption spectroscopy of the thorium-229 nucleus
Abstract The low-energy nuclear transition in thorium-229 (Th-229) has been excited in thorium-doped crystals with laser light1,2,3, opening the path towards a highly stable and robust solid-state optical nuclear clock4. The required laser radiation at 148-nm wavelength has so far been produced using pulsed laser systems, in which only a small fraction of the incident photons has been resonant with the narrow nuclear transition.
Laser spectroscopy on the hyperfine structure and isotope shift of sympathetically cooled $^{229}\mathrm{Th}^{3+}$ ions
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Laser Excitation of the Th-229 Nucleus
Physics News and Commentary Article Text ACKNOWLEDGMENTS Supplemental Material References Viewpoint Shedding Light on the Thorium-229 Nuclear Clock Isomer Published 29 April 2024 Researchers use a laser to excite and precisely measure a long-sought exotic nuclear state, paving the way for precise timekeeping and ultrasensitive quantum sensing. See more in Physics Click to Expand Article Text Click to Expand Supplemental Material Click to Expand References Click to Expand Download & Share × ×
Sympathetic cooling of trapped ${\mathrm{Th}}^{3+}$ alpha-recoil ions for laser spectroscopy
Sympathetic cooling of Th3+ ions is demonstrated in an experiment where Th229 and Th230 are extracted from uranium recoil-ion sources and are confined in a linear Paul trap together with laser-cooled Sr+88 ions. Because of their similar charge-to-mass ratios the ions are closely coupled and arrange themselves into two-species Coulomb crystals containing up to a few tens of Th3+ ions.
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