Collective light shifts of many longitudinal cavity modes induced by coupling to a cold-atom ensemble

• URL: http://arxiv.org/abs/2505.10115v2
• Date: Mon, 10 Nov 2025 09:42:04 GMT
• Title: Collective light shifts of many longitudinal cavity modes induced by coupling to a cold-atom ensemble
• Authors: Marin Ðujić, Mateo Kruljac, Lovre Kardum, Neven Šantić, Damir Aumiler, Ivor Krešić, Ticijana Ban,
• Abstract summary: We experimentally study the interaction between a cold atom cloud and many longitudinal modes of a high quality Fabry-Perot cavity.<n>Using a resonator coupled to more than $105$ intracavity atoms, we detect significant shifts of $sim 100$ cavity modes simultaneously.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: We experimentally study the interaction between a cold atom cloud and many longitudinal modes of a high quality Fabry-Perot cavity, by measuring signatures of collective light shifts in the cavity transmission spectrum of an optical frequency comb probe. Using a resonator coupled to more than $10^5$ intracavity atoms, we detect significant shifts of $\sim 100$ cavity modes simultaneously, which is a direct manifestation of physics beyond the hitherto explored regime of cavity-cold atom interaction with only single or few longitudinal modes at a time. For the cavity mode closest to the atomic resonance, we demonstrate a bistability in the transmission spectrum, arising due to a combined coupling of the cloud to an external pump laser and a cavity mode probed by the optical frequency comb. These results establish a platform for deeper exploration of multifrequency cavity quantum electrodynamics, where ultrashort pulsed sources can be used for optical manipulation, cooling and entanglement of cold atoms in a resonator.

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