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Cavity-immune spectral features in the pulsed superradiant crossover regime

Mikkel Tang1, Stefan A. Schäffer1,2, Asbjørn A. Jørgensen1, Martin R. Henriksen1, Bjarke T. R. Christensen1, Jörg H. Müller1, and Jan W. Thomsen1

  • 1Niels Bohr Institute, University of Copenhagen, Blegdamsvej 17, 2100 Copenhagen, Denmark
  • 2Van der Waals–Zeeman Institute, University of Amsterdam, Science Park 904, 1098 XH Amsterdam, Netherlands

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Phys. Rev. Research 3, 033258 – Published 17 September, 2021

DOI: https://doi.org/10.1103/PhysRevResearch.3.033258

Abstract

Lasing in the bad cavity regime has promising applications in precision metrology due to the reduced sensitivity to cavity noise originating from cavity length fluctuations. Here we investigate the spectral properties and phase behavior of pulsed lasing on the S01−P13 line of Sr88 in a mK thermal ensemble, as first described by S. A. Schäffer et al. [Phys. Rev. A 101, 013819 (2020)]. The system operates in a regime where the Doppler-broadened atomic transition linewidth is several times larger than the cavity linewidth. We find that for some detunings of the cavity resonance, the influence of the cavity noise on the peak lasing frequency can be eliminated to first order despite the system not being deep in the bad cavity regime. Experimental results are compared to a model based on a Tavis-Cummings Hamiltonian, which enables us to investigate the interplay between different thermal velocity classes as the underlying mechanism for the reduction in cavity noise. These velocity-dependent dynamics can occur in pulsed lasing and during the turn-on behavior of lasers in the superradiant crossover regime.

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Phys. Rev. Research 3, 033258– Published 17 September, 2021
  • Received 20 May 2021
  • Accepted 24 August 2021
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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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