Two-tone Doppler cooling of radial two-dimensional crystals in a radiofrequency ion trap
| Autor: | Alexander Kato, Apurva Goel, Raymond Lee, Zeyu Ye, Samip Karki, Jian Jun Liu, Andrei Nomerotski, Boris B. Blinov |
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| Rok vydání: | 2021 |
| Předmět: | |
| DOI: | 10.48550/arxiv.2111.05829 |
| Popis: | We study the Doppler-cooling of radial two-dimensional (2D) Coulomb crystals of trapped barium ions in a radiofrequency trap. Ions in radial 2D crystals experience micromotion of an amplitude that increases linearly with the distance from the trap center, leading to a position-dependent frequency modulation of laser light in each ion's rest frame. We use two tones of Doppler-cooling laser light separated by approximately 100~MHz to efficiently cool distinct regions in the crystals with differing amplitudes of micromotion. This technique allows us to trap and cool more than 50 ions populating 4 shells in a radial two-dimensional crystal, where with a single tone of Doppler cooling light we are limited to 30 ions in 3 shells. We also individually characterize the micromotion of all ions within the crystals, and use this information to locate the center of the trap and to determine the Matthieu parameters $q_{x}$ and $q_{y}$. Comment: 7 Pages, 5 Figures |
| Databáze: | OpenAIRE |
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