A thorium-229 nuclear clock is realized by stabilizing a continuous-wave laser to the 148-nm nuclear excitation with a rapid feedback loop based on absorption spectroscopy.
Laser set-up
In the 229Th interrogation system, a commercial laser (FHG-TA Pro, TOPTICA) provides an output power of approximately 500mW at a wavelength of 296.8nm, frequency-quadrupled in two doubl… [+12411 chars]
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