Cavity-immune features in the spectra of superradiant crossover laser pulses

Abstract

Lasing in the bad cavity regime has promising applications in precision metrology due to the reduced sensitivity to cavity noise. Here we investigate the spectral properties and phase behavior of pulsed lasing on the ${}^1$S${}_0{-}^3$P${}_1$ line of ${}^{88}$Sr in a mK thermal ensemble, as first described in arxiv:1903.12593. The system operates in a regime where the Doppler-broadened atomic transition linewidth is several times larger than the cavity linewidth. We find that by detuning 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.

arXiv comment9 pages, 8 figures

References in corpus (19)

• LIGO: The Laser Interferometer Gravitational-Wave Observatory
• Atomic clock performance beyond the geodetic limit
• 1.5 $\mu$m lasers with sub 10 mHz linewidth
• Prospects for a mHz-linewidth laser
• JILA SrI Optical Lattice Clock with Uncertainty of $2.0\times 10^{-18}$
• Frequency measurements of superradiance from the strontium clock transition
• A Cold-Strontium Laser in the Superradiant Crossover Regime
• Pulse delay time statistics in a superradiant laser with calcium atoms
• Lasing in the superradiant crossover regime
• Lasing on a narrow transition in a cold thermal strontium ensemble
• Optical frequency ratio of a ${}^{171}{\mathrm{Yb}}^{+}$ single-ion clock and a ${}^{87}\mathrm{Sr}$ lattice clock
• Atomic fountains and optical clocks at SYRTE: status and perspectives
• Rugged mHz-Linewidth Superradiant Laser Driven by a Hot Atomic Beam
• A strontium optical lattice clock with $1\times 10^{-17}$ uncertainty and measurement of its absolute frequency
• Active optical frequency standard using sequential coupling of atomic ensembles
• Space-borne Gravitational Wave Observatories
• Continuous guided strontium beam with high phase-space density
• Realization of phase locking in good-bad-cavity active optical clock
• Collective dynamics of inhomogeneously broadened emitters coupled to an optical cavity with narrow linewidth

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• Quantifying the breakdown of the rotating-wave approximation in single-photon superradiance