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Laser Frequency Stabilization, Standards, Measurement, and Applications
Using a laser that is frequency-locked to a Fabry-Pérot etalon of high finesse and stability, we probed the 5d 10 6s 2 S 1/2 (F = 0, m F = 0) ↔ 5d 9 6s 2 2 D 5/2 (F = 2, m F = 0) electric-quadrupole transition of a single laser-cooled 199 Hg + ion stored in a cryogenic radio-frequency ion trap. We observed Fourier-transform limited linewidths as narrow as 6.7 Hz at 282 nm (1.06 x 10 15 Hz). The functional form and estimated values of some of the frequency shifts of the 2 S 1/2 ↔ 2 D 5/2 "clock"doi:10.1117/12.424455 fatcat:rcjxrcvqjvhmhmahntf5hhmxv4