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Towards an indium single-ion optical clock

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6 Author(s)
Peik, E. ; Sektion Phys., Ludwig-Maximilians-Univ., Munchen, Germany ; Abel, J. ; Becker, T. ; Fries, M.
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We are investigating the 5s21S0→5s5p 3P0 transition of a single trapped laser-cooled 115In+ ion as a possible optical frequency standard. This line with a natural linewidth of only 1.1 Hz, corresponding to a Q factor of 1.2·1015, is highly immune to systematic frequency shifts due to external perturbations. For sideband laser cooling and fluorescence detection of the indium ion the 5s21S0→5s5p3P1 transition at 230.6 nm is excited. Temperatures below 100 μK and a mean vibrational quantum number ⟨n⟩<1 of the ion in the trap have been reached. For the clock transition a resolution of 3·10-13 (linewidth 350 Hz) has been obtained so far, limited by the laser linewidth. The absolute frequency of the 1 S03P0 transition was measured by making a link to known reference frequencies of molecular iodine and methane using a frequency chain

Published in:

Frequency and Time Forum, 1999 and the IEEE International Frequency Control Symposium, 1999., Proceedings of the 1999 Joint Meeting of the European  (Volume:2 )

Date of Conference:

1999

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