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首页> 外文期刊>Physical Review, A. Atomic, molecular, and optical physics >Velocity diffusion and radiation trapping force in a one-dimensional expansion of cold atomic clouds in a magneto-optical trap
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Velocity diffusion and radiation trapping force in a one-dimensional expansion of cold atomic clouds in a magneto-optical trap

机译:磁光阱中冷原子云的一维膨胀中的速度扩散和辐射俘获力

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摘要

We experimentally investigate one-dimensional (1D) expansion of a cold cloud of cesium atoms in orthogonal 2D configuration of near resonant laser beams by temporally modulating a pair of counterpropagating trapping beams of a magneto-optical trap (MOT). The cloud is observed to undergo ballistic expansion followed by superballistic explosive growth due to the fluctuations of the 2D radiation force. A model based on the theory of Brownian motion is developed and a comparison of experiments with theory is shown to provide a direct measure of the velocity diffusion coefficient. We also observe sudden contraction of the cloud immediately after switching off the pair of trapping beams, which provides direct evidence for the existence of the radiation trapping force in a MOT.
机译:我们通过临时调制磁光阱(MOT)的一对反向传播的捕获束,对铯原子的冷云在一维(1D)扩展中以接近共振的激光束的正交2D配置进行了研究。由于2D辐射力的波动,观察到云层经历了弹道扩张,随后超弹道爆炸物增长。建立了基于布朗运动理论的模型,并与理论进行了实验比较,以直接测量速度扩散系数。我们还观察到在关闭一对俘获束之后立即突然出现了云的收缩,这为MOT中存在放射俘获力提供了直接证据。

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