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arXiv 0907.5296physics.atom-ph
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二能级系统中的低强度和高强度速度选择相干布居俘获

Low and high intensity velocity selective coherent population trapping in a two-level system

David Wilkowski, Maryvonne Chalony, Robin Kaiser, Anders Kastberg

摘要:

利用689nm窄线宽的互组合谱线,对锶原子二能级系统中的速度选择相干布居俘获进行了亚反冲冷却的实验研究。这里,反冲位移和线宽之间的比率高达0.64。我们发现,在一个更广泛的动量剖面,亚反冲功能的发展,其幅度是强烈依赖于共振失谐。我们将这种结构归因于速度选择相干布居俘获机制。我们还表明,人口捕获现象导致复杂的动量分布的情况下,高度饱和的过渡,显示了众多的subrecoil功能的反冲动量的整数倍。

英文摘要:

An experimental investigation is made of sub-recoil cooling by velocity selective coherent population trapping in a two-level system in Sr. The experiment is carried out using the narrow linewidth intercombination line at 689 nm. Here, the ratio between the recoil shift and the linewidth is as high as 0.64. We show that, on top of a broader momentum profile, subrecoil features develop, whose amplitude is strongly dependent on the detuning from resonance. We attribute this structure to a velocity selective coherent population trapping mechanism. We also show that the population trapping phenomenon leads to complex momentum profiles in the case of highly saturated transitions, displaying a multitude of subrecoil features at integer multiples of the recoil momentum.

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