具有反向自旋原子的冷原子空间钟
Cold Atom Space Clock with Counter-Propagating Atoms
摘要：
讨论了在微重力条件下利用反向传播冷原子实现空间冷原子钟的可行性。空间钟的设计是基于原子束钟与拉姆齐腔，除了磁光阱（MOT）放置在每一侧。冷原子同时从时钟两侧的MOT发射，并以相反的方向相互移动。发射原子的速度被精确地控制到Ramsauer-Townsend共振，从而不会发生额外的碰撞频移。这种结构可以有效地消除腔相移引起的频移，提高信噪比。
英文摘要：
We discuss the feasibility to realize a space cold atom clock with counter-propagating cold atoms in microgravity. The design of the space clock is based on atomic beam clock with a Ramsey cavity, except a magneto-optical trap (MOT) is placed at each side. Cold atoms are launched from MOTs at both side of the clock simultaneously and move at counter-direction towards each other. The velocity of launched atoms is precisely controlled to the Ramsauer-Townsend resonance so that no additional collision frequency shift is taken place. Such a configuration can efficiently cancel the frequency shift led from cavity phase shift and increase the signal to noise.
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