Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line

Bruce, G D and Haller, E and Peaudecerf, B and Cotta, D A and Andia, M and Wu, S and Johnson, M Y H and Lovett, B W and Kuhr, S (2017) Sub-Doppler laser cooling of 40K with Raman gray molasses on the D2 line. Journal of Physics B: Atomic, Molecular and Optical Physics, 50 (9). ISSN 0953-4075

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    Abstract

    Gray molasses is a powerful tool for sub-Doppler laser cooling of atoms to low temperatures. For alkaline atoms, this technique is commonly implemented with cooling lasers which are blue-detuned from either the D1 or D2 line. Here we show that efficient gray molasses can be implemented on the D2 line of 40K with red-detuned lasers. We obtained temperatures of 48(2) µK, which enables direct loading of 9.2(3)x10^6 atoms from a magneto-optical trap into an optical dipole trap. We support our findings by a one-dimensional model and three-dimensional numerical simulations of the optical Bloch equations which qualitatively reproduce the experimentally observed cooling effects.

    Author(s):Bruce, G D, Haller, E ORCID: https://orcid.org/0000-0002-7951-1721, Peaudecerf, B, Cotta, D A ORCID: https://orcid.org/0000-0001-8151-7834, Andia, M ORCID: https://orcid.org/0000-0003-3675-9126, Wu, S, Johnson, M Y H, Lovett, B W and Kuhr, S ORCID: https://orcid.org/0000-0001-8386-5357
    Item type:Article
    ID code:60345
    Keywords:gray molasses, laser cooling, ultracold atoms, atomic physics, sub-Doppler cooling, Physics, Physics and Astronomy(all)
    Subjects:Science > Physics
    Department:Faculty of Science > Physics
    Strategic Research Themes > Measurement Science and Enabling Technologies
    Depositing user: Pure Administrator
    Date deposited:28 Mar 2017 15:18
    Last modified:09 Aug 2019 00:56
    URI:https://strathprints.strath.ac.uk/id/eprint/60345
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