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arXiv · 2506.12267

Fully Collective Superradiant Lasing with Vanishing Sensitivity to Cavity Length Vibrations

Jarrod T. Reilly·Simon B. Jäger·John Cooper·Murray J. Holland
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Abstract

To date, realization of a continuous-wave active atomic clock has been elusive primarily due to parasitic heating from spontaneous emission while repumping the atoms. Here, we propose a solution to this problem by replacing the random emission with coupling to an auxiliary cavity, making repumping a fully collective process. While it is known that collective two-level models do not possess a generic lasing threshold, we show this restriction is overcome with multi-level atoms since collective pumping and decay can be performed on distinct transitions. Using relevant atomic parameters, we find this system is capable of producing an $\mathcal{O}$(100 $\mu$Hz)-linewidth continuous-wave superradiant laser. Our principal result is the potential for an operating regime with cavity length vibration sensitivity below $\mathcal{O}(10^{-14} / g)$, including a locus of parameter values where it completely vanishes even at steady-state.

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Jarrod T. Reilly, Simon B. Jäger, John Cooper, Murray J. Holland. 2025-06-13. Fully Collective Superradiant Lasing with Vanishing Sensitivity to Cavity Length Vibrations. https://doi.org/10.1103/v6jq-m6sk

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