Related papers: A permanent-magnet Zeeman slower and magneto-optical trap for calcium atoms for ultracold Rydberg physics

A permanent-magnet Zeeman slower and magneto-optical trap for calcium atoms for ultracold Rydberg physics

URL: http://arxiv.org/abs/2511.23245v1
Date: Fri, 28 Nov 2025 14:52:53 GMT
Title: A permanent-magnet Zeeman slower and magneto-optical trap for calcium atoms for ultracold Rydberg physics
Authors: Eduardo Marin-Bujedo, Julien A. L. Grondin, Thomas Schiltz, Thomas Corbo, Xavier Urbain, Matthieu Génévriez,
Abstract summary: We report the construction and characterization of an experimental setup for producing a cold gas of $40$Ca atoms.<n>Ground-state atoms in the cold gas are excited to high Rydberg states via a resonant three-photon-excitation scheme.<n>We demonstrate Rydberg spectroscopy of calcium, confirming the system's suitability for ultracold Rydberg physics experiments.
Score: 0.0
License: http://creativecommons.org/licenses/by-nc-nd/4.0/
Abstract: We report the construction and characterization of an experimental setup for producing a cold gas of $^{40}$Ca atoms and excite them to high Rydberg states with a resonant three-photon-excitation scheme. The apparatus comprises four stages, each designed in-house. An oven heated to $\sim 500^\circ$C generates an atomic beam that is collimated by a capillary stack. The beam is sent into a passive, permanent-magnet-based Zeeman slower that reduces the atomic velocity to $30$ m/s. The slow atoms are captured in a magneto-optical trap (MOT) and cooled to $1.0(3)$ mK with a trapping time of $16(2)$ ms. Ground-state atoms in the cold gas are excited to high Rydberg states via resonant excitation through the intermediate $4s4p\, ^1P_1$ and $4s4d\, ^1D_2$ states. The MOT is operated at the center of an electrode stack, which serves to apply continuous and pulsed electric fields and field-ionize the Rydberg atoms for detection. We benchmark our MOT against previous implementations and find its performance consistent with state-of-the-art results in terms of temperature and trapping lifetime. Finally, we demonstrate Rydberg spectroscopy of calcium, confirming the system's suitability for ultracold Rydberg physics experiments.

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