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Optical Spectroscopy of High- L Rydberg States of Calcium

Alina Gearba, Jefferson Sesler, Daniel McIlhenny, Randy Knize, Jerry Sell, Brett D DePaola, S. R. Lundeen

Published May 1, 2019• 0 citations
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A permanent-magnet Zeeman slower and magneto-optical trap for calcium atoms for ultracold Rydberg physics

Eduardo Marin-Bujedo, Julien A. L. Grondin, Thomas Schiltz +3 more

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.

physics.atom-phCross-listedarXiv:2511.23245•Review of Scientific Instruments•Dec 1, 2025•0 citations
We report the construction and characterization of an experimental setup for producing a cold gas of 40^{40}40Ca 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 ∼500∘\sim 500^\circ∼500∘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 303030 m/s. The slow atoms are captured in a magneto-optical trap (MOT) and cooled to 1.0(3)1.0(3)1.0(3) mK with a trapping time of 16(2)16(2)16(2) ms. Ground-state atoms in the cold gas are excited to high Rydberg states via resonant excitation through the intermediate 4s4p 1P14s4p\, ^1P_14s4p1P1​ and 4s4d 1D24s4d\, ^1D_24s4d1D2​ 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.