利用辐射的碰撞再分布的钾-氩气体混合物的激光冷却
Laser cooling of a potassium-argon gas mixture using collisional redistribution of radiation
摘要：
我们研究了原子气体的碰撞再分布激光冷却，这种技术适用于几百巴压力下的超致密原子系综。光学活性原子与缓冲气体的频繁碰撞使原子与远红失谐激光束发生共振，而自发衰变发生在接近未扰动的共振频率处。在这样的激发循环中，从样品中提取热能kT量级的动能。在这里，我们报告最近的实验研究钾-氩气体混合物的冷却，这与早期实验中研究的铷-氩混合物相比，具有较小的光学活性碱原子的精细结构。我们观察到钾-氩气体混合物的相对冷却120 K。
英文摘要：
We study laser cooling of atomic gases by collisional redistribution, a technique applicable to ultradense atomic ensembles at a pressure of a few hundred bar. Frequent collisions of an optically active atom with a buffer gas shift atoms into resonance with a far red detuned laser beam, while spontaneous decay occurs close to the unperturbed resonance frequency. In such an excitation cycle, a kinetic energy of the order of the thermal energy kT is extracted from the sample. Here we report of recent experiments investigating the cooling of a potassium-argon gas mixture, which compared to an rubidium-argon mixture investigated in earlier experiments has a smaller fine structure of the optically active alkali atom. We observe a relative cooling of the potassium-argon gas mixture by 120 K.
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