Towards a compact atomic clock based on coherent population trapping and the grating magneto-optical trap

Gregory W. Hoth, Rachel Elvin, Michael Wright, Ben Lewis, Aidan S. Arnold, Paul F. Griffin, Erling Riis

Research output: Contribution to conferenceProceeding

4 Citations (Scopus)
72 Downloads (Pure)


The combination of coherent population trapping (CPT) and laser cooled atoms is a promising platform for realizing the next generation of compact atomic frequency references. Towards this goal, we have developed an apparatus based on the grating magneto-optical trap (GMOT) and the high-contrast lin ⊥ lin CPT scheme in order to explore the performance that can be achieved. One important trade-off for cold-atom systems arises from the need to simultaneously maximize the number of cold atoms available for interrogation and the repetition rate of the system. This compromise can be mitigated by recapturing cold atoms from cycle to cycle. Here, we report a quantitative characterization of the cold atom number in the recapture regime for our system, which will enable us to optimize this trade-off. We also report recent measurements of the short-term frequency stability with a short-term Allan deviation of 3 × 10-11/τ up to an averaging time of τ = 10 s.
Original languageEnglish
Number of pages8
Publication statusPublished - 1 Mar 2019
EventSPIE Photonics West OPTO - San Francisco, United States
Duration: 2 Feb 20197 Feb 2019


ConferenceSPIE Photonics West OPTO
Abbreviated titlePhotonics WEST
Country/TerritoryUnited States


  • coherent population trapping
  • grating magneto-optical traps
  • microwave atomic clock
  • laser cooling
  • cold-atoms
  • micro-fabricated grating chips


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