Walby, S; Korwin, A; Hendricks, R J; Szymaniec, K (2026) Miniaturized atomic fountain clock. Applied Physics Letters, 128 (1). 014002 ISSN 0003-6951

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Abstract

A miniaturized 87Rb fountain clock has been developed and tested. It preserves the possibility of launching the atoms to 30 cm above the Ramsey cavity, which is typical for high-performance fountain clocks, while the physics package size is reduced to 80 cm in height and 36 dm3 in volume, by a factor of 2.5 and 20, respectively, compared to National Physical Laboratory Cs fountain clocks. A short-term fractional instability of 4.2 × 10−13/τ/s, and averaging down below 10−15, has been shown. The long-term stability of the systematic effects most affected by the miniaturization (second-order Zeeman shift and light shift) is also discussed. The mini-fountain clock has potential application as an ultra-stable holdover clock and a secondary frequency standard realizing the SI second.

Item Type:	Article
Subjects:	Time and Frequency > Microwave Frequency Standards
Divisions:	Time & Frequency
Identification number/DOI:	10.1063/5.0303805
Last Modified:	17 Sep 2026 14:22
URI:	https://eprintspublications.npl.co.uk/id/eprint/10537