Abstract
We are investigating the 5 s 2 1 S 0 → 5 s 5 p 3 P 0 transition of a single trapped laser-cooled 115In+ ion as a candidate for an optical frequency standard. This line with a natural linewidth of only 0.8 Hz is highly immune to systematic frequency shifts. For sideband laser cooling and fluorescence detection of the indium ion the 5 s 2 1 S 0 → 5 s 5 p 3 P 1 transition at 230.6 nm is excited. Temperatures below 100 μK and a mean vibrational quantum number \( \left\langle n \right\rangle < 1 \) of the ion in the trap have been reached. For the clock transition a resolution of 1.3·10-13 (linewidth 170 Hz) has been obtained so far, limited by the short term frequency fluctuations of the clock laser. The absolute frequency of the 1 S 0 → 3 P 0 transition was measured by making a link to the reference frequency of the methane-stabilised HeNe laser using a frequency chain.
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Becker, T. et al. (2001). Indium Single-Ion Optical Frequency Standard. In: Karshenboim, S.G., Bassani, F., Pavone, F., Inguscio, M., Hänsch, T. (eds) The Hydrogen Atom. Lecture Notes in Physics, vol 570. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-45395-4_37
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