交叉束慢化增强窄线镱磁光阱
Crossed-Beam slowing to enhance narrow-line Ytterbium Magneto-Optic Traps
摘要：
我们展示了一种方法，以提高原子装载率的镱（Yb）磁光阱（MOT）上的556 nm ${^1S}_0 \rightarrow {^3P}_1$互组合过渡（窄线宽$Γ_g = 2π\times 182$ kHz）。在399 nm ${^1S}_0 \rightarrow {^1P}_1$跃迁（宽线宽$Γ_p = 2π\times 29 $ MHz）附近的原子束的传统塞曼减慢之后，在交叉光束几何形状中的两个激光束，频率调谐在相同跃迁附近，在紧接MOT之前提供额外的减慢。使用这种技术，我们观察到的一个因素的改进，在窄线Yb MOT的原子加载率。这种方法的相对简单性和通用性，使它很容易采用其他实验涉及窄线MOT。我们还提出了一个数值模拟，这两个阶段的慢化过程中所观察到的实验参数的依赖性，并使用它来评估潜在的改进的方法。
英文摘要：
We demonstrate a method to enhance the atom loading rate of a ytterbium (Yb) magneto-optic trap (MOT) operating on the 556 nm ${^1S}_0 \rightarrow {^3P}_1$ intercombination transition (narrow linewidth $Γ_g = 2π\times 182$ kHz). Following traditional Zeeman slowing of an atomic beam near the 399 nm ${^1S}_0 \rightarrow {^1P}_1$ transition (broad linewidth $Γ_p = 2π\times 29 $ MHz), two laser beams in a crossed-beam geometry, frequency tuned near the same transition, provide additional slowing immediately prior to the MOT. Using this technique, we observe an improvement by a factor of 6 in the atom loading rate of a narrow-line Yb MOT. The relative simplicity and generality of this approach make it readily adoptable to other experiments involving narrow-line MOTs. We also present a numerical simulation of this two-stage slowing process which shows good agreement with the observed dependence on experimental parameters, and use it to assess potential improvements to the method.
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