Sympathetic cooling and detection of a hot trapped ion by a cold one
Sympathetic cooling and detection of a hot trapped ion by a cold one
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DOI：
10.1088/1367-2630/17/10/103001
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发表时间：
2015-09-30
影响因子：
3.3
通讯作者：
Roos, C. F.
中科院分区：
文献类型：
--
作者：
Guggemos, M.;Heinrich, D.;Roos, C. F.
我们研究了一个离子被另一个激光冷却的离子或小离子晶体相交冷却的动力学。为此，我们发展了弱库仑相互作用极限下冷却动力学的简单模型。在实验上，我们通过激光烧蚀产生的中性原子的光致电离产生了一种双离子的钙铝离子晶体。我们用时间分辨荧光光谱表征了激光烧蚀原子穿过陷阱的速度分布。我们观察到中性原子的速度比加热样品的速度高得多，结果发现在结晶发生之前有很长的交感冷却时间。我们的关键结果是一种新的技术，可以通过监测陷阱中已经存在的多普勒冷却离子的运动状态来检测能量在eV范围内的初始热离子的负载。这项技术不仅能探测到离子，还能提供交感降温过程的动力学信息。
We investigate the dynamics of an ion sympathetically cooled by another laser-cooled ion or small ion crystal. To this end, we develop simple models of the cooling dynamics in the limit of weak Coulomb interactions. Experimentally, we create a two-ion crystal of Ca+ and Al+ by photo-ionization of neutral atoms produced by laser ablation. We characterize the velocity distribution of the laser-ablated atoms crossing the trap by time-resolved fluorescence spectroscopy. We observe neutral atom velocities much higher than the ones of thermally heated samples and find as a consequence long sympathethic cooling times before crystallization occurs. Our key result is a new technique for detecting the loading of an initially hot ion with energy in the eV range by monitoring the motional state of a Doppler-cooled ion already present in the trap. This technique not only detects the ion but also provides information about the dynamics of the sympathetic cooling process.