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An optical clock based on a single trapped 88Sr+ ion.

Margolis, H S; Barwood, G P; Huang, G; Klein, H A; Lea, S N; Marra, G; Tsatourian, V; Walton, B R; Gill, P (2008) An optical clock based on a single trapped 88Sr+ ion. In: Proceedings of the 7th Symposium on Frequency Standards and Metrology., 5-11 October 2008, Pacific Grove, California, USA.

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The 5s 2S1/2 - 4d 2D5/2 electric quadrupole transition in a single trapped and laser-cooled 88Sr+ ion provides the reference for a highly stable and accurate optical clock. This paper describes recent progress on the 88Sr+ optical clocks under development at NPL. An ultrastable laser at 674 nm is used to excite the clock transition and a fractional frequency resolution of 2 x 10^{-14} has been achieved, corresponding to a linewidth of 9 Hz. A relative frequency instability of 2 x 10^{-15} at 5000 s has been observed in the comparison between two similar systems and the fractional uncertainty in the absolute frequency of the clock transition is 3.8 x 10^{-15}. Improvements to the experimental arrangement are in progress and are expected to lead to a 88Sr+ optical clock with stability and reproducibility exceeding that of the primary caesium standard.

Item Type: Conference or Workshop Item (UNSPECIFIED)
Subjects: Time and Frequency
Time and Frequency > Optical Frequency Standards and Metrology
Last Modified: 02 Feb 2018 13:15
URI: http://eprintspublications.npl.co.uk/id/eprint/4427

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