Impact of laser frequency noise in coherent population trapping with cold atoms

Hoth, Gregory W. and Elvin, Rachel and Wright, Michael W. and Lewis, Ben and Arnold, Aidan S. and Griffin, Paul F. and Riis, Erling and Gruet, Florian and Affolderbach, Christoph and Mileti, Gaetano; (2019) Impact of laser frequency noise in coherent population trapping with cold atoms. In: 2019 Joint Conference of the IEEE International Frequency Control Symposium and European Frequency and Time Forum (EFTF/IFC). IEEE, USA. ISBN 978-1-5386-8305-7

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    Abstract

    Laser-cooled atoms and coherent population trapping (CPT) are promising tools for realizing a compact microwave frequency reference with excellent stability. To realize a high performance device, it is necessary to understand and minimize all sources of technical noise. Here, we investigate the role of laser frequency noise in cold-atom CPT with an apparatus based on the grating magneto-optical trap (GMOT). We compare the performance of our setup with an external cavity diode laser (ECDL) and a distributed feedback diode laser (DFB). With the DFB, laser frequency noise is one of the dominant noise sources in our system. With the ECDL, it is significantly reduced. We also report frequency stability measurements of our apparatus with a short-term Allan deviation Sigma_y (tau) ≈ 3(times)10-11/rt τ up to τ= 10 s.

    ORCID iDs

    Hoth, Gregory W., Elvin, Rachel ORCID logoORCID: https://orcid.org/0000-0003-0450-4727, Wright, Michael W., Lewis, Ben, Arnold, Aidan S. ORCID logoORCID: https://orcid.org/0000-0001-7084-6958, Griffin, Paul F. ORCID logoORCID: https://orcid.org/0000-0002-0134-7554, Riis, Erling ORCID logoORCID: https://orcid.org/0000-0002-3225-5302, Gruet, Florian, Affolderbach, Christoph and Mileti, Gaetano;