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  • Letter
  • Open Access

Narrow-line-mediated Sisyphus cooling in the P23 metastable state of strontium

Chun-Chia Chen (陳俊嘉)1,*,†, Ryoto Takeuchi2,3,*, Shoichi Okaba1,2, and Hidetoshi Katori1,2,3,‡

  • *These authors contributed equally to this work.
  • †Contact author: chenchunchia@gmail.com
  • ‡Contact author: katori@amo.t.u-tokyo.ac.jp
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Phys. Rev. Research 7, L022076 – Published 25 June, 2025

DOI: https://doi.org/10.1103/b26p-12j4

Abstract

We demonstrate narrow-line-mediated Sisyphus cooling of magnetically trapped strontium (Sr) in the 5s5pP23 state. A 641nm standing-wave, blue detuned from the 5s4dD33→ 5p4dF43 transition, creates a dissipative optical lattice in the D33 state. By combining Doppler cooling and Sisyphus cooling on the 5s5pP23→ 5s4dD33 transition at 2.92µm, we observed efficient cooling of magnetically trapped atoms. By optically pumping the atoms to the 5s5pP03 state, we facilitate continuous outcoupling via a moving optical lattice with twofold improvement in atom number. Our scheme applies to next-generation quantum sensors using continuous ultracold atomic beams.

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Phys. Rev. Research 7, L022076– Published 25 June, 2025
  • Received 4 March 2025
  • Accepted 12 May 2025
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.

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