High-flux two-dimensional magneto-optical-trap source for cold lithium atoms
High-flux two-dimensional magneto-optical-trap source for cold lithium atoms
复制标题
DOI：
10.1103/physreva.80.013409
复制
发表时间：
2009-07-01
影响因子：
2.9
通讯作者：
Walraven, J. T. M.
中科院分区：
文献类型：
--
作者：
Tiecke, T. G.;Gensemer, S. D.;Walraven, J. T. M.
我们展示了一个二维磁光阱（2D MOT）作为冷Li-6原子的光束源。源从在小于或接近T小于或接近700 K的600 ° C的温度范围内操作的烘箱侧面装载。通过将原子加载到位于源下游220 mm处的三维MOT中来分析性能。当温度接近700 K时，最大俘获率约为10（9）s（-1），俘获原子总数可达10（10）个。重新捕获的分数估计为30 +/-10%，并受到光束发散度的限制。通过增加推射束的强度，射束中的最可能速度（alpha（z））从18 m/s变化到70 m/s。该源是相当单色的，在α（z）= 36 m/s时，半最大速度扩展的全宽为11 m/s，这表明侧面加载完全消除了来自烘箱的热蒸汽对光束的污染。我们确定耗尽的低速尾炉通量的限制损失机制。我们的方法适用于其他原子物种。
We demonstrate a two-dimensional magneto-optical trap (2D MOT) as a beam source for cold Li-6 atoms. The source is side loaded from an oven operated at temperatures in the range 600 less than or similar to T less than or similar to 700 K. The performance is analyzed by loading the atoms into a three-dimensional MOT located 220 mm downstream from the source. The maximum recapture rate of similar to 10(9) s(-1) is obtained for T approximate to 700 K and results in a total of up to 10(10) trapped atoms. The recaptured fraction is estimated to be 30 +/- 10% and limited by beam divergence. The most-probable velocity in the beam (alpha(z)) is varied from 18 to 70 m/s by increasing the intensity of a push beam. The source is quite monochromatic with a full width at half maximum velocity spread of 11 m/s at alpha(z) = 36 m/s, demonstrating that side loading completely eliminates beam contamination by hot vapor from the oven. We identify depletion of the low-velocity tail of the oven flux as the limiting loss mechanism. Our approach is suitable for other atomic species.