A cold-atom Ramsey clock with a low volume physics package

A. Bregazzi, E. Batori, B. Lewis, C. Affolderbach, G. Mileti, E. Riis, P.F. Griffin

Research output: Contribution to journalArticlepeer-review

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We demonstrate a Ramsey-type microwave clock interrogating the 6.835 GHz ground-state transition in cold 87Rb atoms loaded from a grating magneto-optical trap (GMOT) enclosed in an additively manufactured loop-gap resonator microwave cavity. A short-term stability of 1.5×10−11 τ−1/2 is demonstrated, in reasonable agreement with predictions from the signal-to-noise ratio of the measured Ramsey fringes. The cavity-grating package has a volume of ≈67 cm3, ensuring an inherently compact system while the use of a GMOT drastically simplifies the optical requirements for laser cooled atoms. This work is another step towards the realisation of highly compact portable cold-atom frequency standards.
Original languageEnglish
Article number931
Number of pages7
JournalScientific Reports
Issue number1
Publication statusPublished - 9 Jan 2024


  • grating magneto-optical trap
  • cold-atom frequency standards
  • Ramsey-type microwave clock


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