Subnatural Linewidth Superradiant Lasing with Cold Sr88 Atoms

Sofus Laguna Kristensen, Eliot Bohr, Julian Robinson-Tait, Tanya Zelevinsky, Jan W. Thomsen, and Jörg Helge Müller
Phys. Rev. Lett. 130, 223402 – Published 31 May 2023

Abstract

Superradiant lasers operate in the bad-cavity regime, where the phase coherence is stored in the spin state of an atomic medium rather than in the intracavity electric field. Such lasers use collective effects to sustain lasing and could potentially reach considerably lower linewidths than a conventional laser. Here, we investigate the properties of superradiant lasing in an ensemble of ultracold Sr88 atoms inside an optical cavity. We extend the superradiant emission on the 7.5 kHz wide P31S10 intercombination line to several milliseconds, and observe steady parameters suitable for emulating the performance of a continuous superradiant laser by fine tuning the repumping rates. We reach a lasing linewidth of 820 Hz for 1.1 ms of lasing, nearly an order of magnitude lower than the natural linewidth.

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  • Received 20 February 2023
  • Accepted 4 May 2023

DOI:https://doi.org/10.1103/PhysRevLett.130.223402

© 2023 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Sofus Laguna Kristensen1,*, Eliot Bohr1, Julian Robinson-Tait1, Tanya Zelevinsky2, Jan W. Thomsen1, and Jörg Helge Müller1,†

  • 1Niels Bohr Institute, University of Copenhagen, DK-2100 Copenhagen, Denmark
  • 2Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027-5255, USA

  • *sofus.kristensen@nbi.ku.dk
  • muller@nbi.ku.dk

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Vol. 130, Iss. 22 — 2 June 2023

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