Continuous collective strong coupling between atoms and a high finesse optical cavity

• URL: http://arxiv.org/abs/2211.00158v1
• Date: Mon, 31 Oct 2022 21:53:37 GMT
• Title: Continuous collective strong coupling between atoms and a high finesse optical cavity
• Authors: Julia R. K. Cline, Vera M. Sch\"afer, Zhijing Niu, Dylan J. Young, Tai Hyun Yoon and James K. Thompson
• Abstract summary: We demonstrate continuous loading of strontium atoms into a high finesse ring cavity. The ring cavity allows us to realize a deterministic conveyor belt to transport atoms away from the loading region. This work opens the path to the creation of a continuous wave superradiant laser with millihertz linewidth.
• Score: 0.0
• License: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Abstract: We demonstrate continuous loading of strontium atoms into a high finesse ring cavity and observe continuous strong collective coupling in the form of a vacuum Rabi splitting between the atoms and the cavity on the 7.5 kHz transition $^1{\rm S}_0$ to $^3{\rm P}_1$. The atoms are loaded into the cavity from a 3D narrow linewidth molasses, thus avoiding large magnetic field gradients and associated broadening of transition frequencies. The ring cavity allows us to realize a deterministic conveyor belt to transport atoms away from the loading region where the laser cooling beams lead to broadening of the strontium clock transition. We trap up to $10^6$ atoms in an intracavity 813 nm lattice in the Lamb-Dicke regime, and transport the atoms along the cavity axis. This work opens the path to the creation of a continuous wave superradiant laser with millihertz linewidth enabling searches for new physics and the use of high-precision optical frequency references outside of low vibration laboratory environments.

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