Two-tone Doppler cooling of radial two-dimensional crystals in a radio-frequency ion trap
Two-tone Doppler cooling of radial two-dimensional crystals in a radio-frequency ion trap
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DOI：
10.1103/physreva.105.023101
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发表时间：
2021-11
影响因子：
2.9
通讯作者：
A. Kato;Apurva Goel;Ray-Kuag Lee;Zeyu Ye;S. Karki;Jian Jun Liu;A. Nomerotski;B. Blinov
中科院分区：
文献类型：
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作者：
A. Kato;Apurva Goel;Ray-Kuag Lee;Zeyu Ye;S. Karki;Jian Jun Liu;A. Nomerotski;B. Blinov
研究了射频阱中钡离子径向二维库仑晶体的多普勒冷却。径向2D晶体中的离子经历幅度随离陷阱中心的距离线性增加的微动，导致每个离子的静止帧中的激光的位置依赖性频率调制。我们使用两个音调的多普勒冷却激光分离约100 MHz，有效地冷却不同区域的晶体与不同幅度的微动。这种技术使我们能够捕获和冷却超过50个离子，这些离子分布在径向二维晶体中的4个壳层中，而使用单频多普勒冷却光，我们仅限于3个壳层中的30个离子。我们还分别描述了晶体中所有离子的微动，并利用这些信息来确定陷阱的中心和确定马蒂厄参数q_{x}$和q_{y}$。
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 $q_{y}$.