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

Hoth, Gregory W. and Elvin, Rachel and Wright, Michael and Lewis, Ben and Arnold, Aidan S. and Griffin, Paul F. and Riis, Erling (2019) Towards a compact atomic clock based on coherent population trapping and the grating magneto-optical trap. In: SPIE Photonics West OPTO, 2019-02-02 - 2019-02-07, San Francisco.

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    Abstract

    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.