Revisiting the capture velocity of a cesium magneto-optical trap: model, simulation and experiment
Revisiting the capture velocity of a cesium magneto-optical trap: model, simulation and experiment
复制标题
重新审视铯磁光陷阱的捕获速度：模型、模拟和实验
DOI：
10.1088/1054-660x/24/12/125502
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发表时间：
2014
期刊：
影响因子：
1.2
通讯作者：
M. Ahmed
中科院分区：
文献类型：
--
作者：
M. Anwar;D. Magalhães;S. T. Müller;M. Faisal;M. Nawaz;M. Ahmed
在这项工作中，我们从理论、模拟和实验三个方面研究了磁光陷阱中的俘获过程。从捕获速率R出发，测量了铯蒸气单胞磁光陷阱(VCMOT)的捕获速度Vc，并根据捕获速度、本底密度和陷阱激光直径建立了捕获速度的精确模型。我们测量了不同俘获激光强度和磁场梯度下铯VCMOT的俘获速度。我们观察到俘获速度既是一种阻尼力，也是一种恢复力现象。我们通过模拟一维铯原子多光子发射机中的单原子轨迹来支持我们的发现。最后，我们得出结论，两个MOT可以具有相同的捕获速度，但捕获速率却非常不同，从而揭示出这是MOT的两个根本不同的特征。
In this work, we have explored ab initio the capture process in a magneto-optical trap by theory, simulation and experiment. We measured the capture velocity vc of a cesium vapor cell magneto-optical trap (VCMOT) from its capture rate R and developed an exact model for the capture rate of a VCMOT in terms of its capture velocity, background density and trap laser beam diameter. We measured the capture velocity of a cesium VCMOT for various trap laser intensities and magnetic field gradients. We observed that the capture velocity is a damping force as well as a restoring force phenomenon. We supported our findings by performing simulations for single atom trajectories in a 1D cesium MOT. Finally, we concluded that two MOTs can have the same capture velocities but very different capture rates, thereby revealing that these are two fundamentally different characteristics of the MOT.