Magneto-Optical Trap with Millimeter Ball Lenses
Magneto-Optical Trap with Millimeter Ball Lenses
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DOI：
10.1103/physrevapplied.14.044013
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发表时间：
2020-10-09
影响因子：
4.6
通讯作者：
Raithel, Georg
中科院分区：
文献类型：
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作者：
Nichols, Cainan S.;Nofs, Leo M.;Raithel, Georg
我们提出了一种基于毫米球透镜的磁光陷阱 (MOT) 设计，该设计包含在边长为 19 毫米的金属立方体内。球透镜产生高度发散的锥形 MOT 捕获光束。在我们的实验和轨迹模拟中，我们研究了光束发散度和光强梯度对 MOT 性能的影响。我们在球透镜 MOT 中捕获了大约 4.2 x 10(5) Rb-85 原子，密度为 3.2 x 10(9) cm(-3)，加载时间为 1.3 s。实验测量和轨迹模型用于校准球透镜高度发散光场中的捕获效率。该设计的优点包括透镜和腔室尺寸小，有利于小型化、无需大直径光束路径以及激光功率要求低。这些特征有利于原子陷阱几何形状具有明确的电磁边界条件，满足离子和等离子体陷阱的要求，以及有效屏蔽黑体和直流杂散场。
We present a magneto-optical trap (MOT) design based on millimeter ball lenses, contained within a metal cube of 19-mm side length. The ball lenses create highly divergent conical MOT trapping beams. In our experiment and in trajectory simulations, we study the effect of beam divergence and light-intensity gradients on MOT performance. We trap approximately 4.2 x 10(5) Rb-85 atoms in our ball-lens MOT at a density of 3.2 x 10(9) cm(-3) and a loading time of 1.3 s. Experimental measurements and the trajectory model are used to calibrate the trapping efficiency in the highly divergent light fields of the ball lenses. The advantages of the design include small lens and chamber sizes favorable to miniaturization, the absence of large-diameter optical-beam pathways, and a low laser-power requirement. These features are conducive to atom-trap geometries with well-defined electromagnetic boundary conditions, as required for ion and plasma traps, and for efficient shielding of black-body and dc stray fields.