Physics – Quantum Physics
Scientific paper
2000-10-05
Opt. Lett. Vol. 25, No. 23, 1729 (2000)
Physics
Quantum Physics
3 pages, 2 figures. accepted for publication in Opt. Lett
Scientific paper
10.1364/OL.25.001729
The absolute frequency of the In$^{+}$ $5s^{2 1}S_{0}$ - $5s5p^{3}P_{0}$ clock transition at 237 nm was measured with an accuracy of 1.8 parts in $10^{13}$. Using a phase-coherent frequency chain, we compared the $^{1}S_{0}$ - $^{3}P_{0}$ transition with a methane-stabilized He-Ne laser at 3.39 $\mu$m which was calibrated against an atomic cesium fountain clock. A frequency gap of 37 THz at the fourth harmonic of the He-Ne standard was bridged by a frequency comb generated by a mode-locked femtosecond laser. The frequency of the In$^{+}$ clock transition was found to be $1 267 402 452 899.92 (0.23)$ kHz, the accuracy being limited by the uncertainty of the He-Ne laser reference. This represents an improvement in accuracy of more than 2 orders of magnitude on previous measurements of the line and now stands as the most accurate measurement of an optical transition in a single ion.
Bagayev Sergei N.
Becker Th.
Eichenseer M.
Hänsch Theodor W.
Holzwarth Ronald
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