• Open Access

Lasing on a narrow transition in a cold thermal strontium ensemble

Stefan A. Schäffer, Mikkel Tang, Martin R. Henriksen, Asbjørn A. Jørgensen, Bjarke T. R. Christensen, and Jan W. Thomsen
Phys. Rev. A 101, 013819 – Published 17 January 2020

Abstract

Highly stable laser sources based on narrow atomic transitions provide a promising platform for direct generation of stable and accurate optical frequencies. Here we investigate a simple system operating in the high-temperature regime of cold atoms. The interaction between a thermal ensemble of Sr88 at mK temperatures and a medium-finesse cavity produces strong collective coupling and facilitates high atomic coherence, which causes lasing on the dipole forbidden S01P13 transition. We experimentally and theoretically characterize the lasing threshold and evolution of such a system and investigate decoherence effects in an unconfined ensemble. We model the system using a Tavis-Cummings model and characterize the velocity-dependent dynamics of the atoms as well as the dependency on the cavity detuning.

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  • Received 20 March 2019
  • Revised 17 November 2019

DOI:https://doi.org/10.1103/PhysRevA.101.013819

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.

©2020 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Stefan A. Schäffer, Mikkel Tang, Martin R. Henriksen, Asbjørn A. Jørgensen, Bjarke T. R. Christensen, and Jan W. Thomsen

  • Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark

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Issue

Vol. 101, Iss. 1 — January 2020

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