局域中空光束中原子的强度梯度冷却

提出了一种采用蓝失谐局域中空光束实现中性原子冷却与囚禁的新方法，并采用Monte-Carlo模拟方法研究了局域中空光束中原子强度梯度冷却（即Sisyphus冷却）的 动力学过程. 研究发现一个温度约为5μK和密度为10^12—10^13cm^3的超冷原子样品可以在我们的单束局域中空光束势阱中获得，而且这一原子密度可通过改变聚焦系统的相对孔径来加以调控. 因此，这一蓝失谐的局域中空光束还可用于实现全光型玻色-爱因斯坦凝聚. 关键词： 局域中空光束 原子囚禁 强度梯度冷却

Intensity-gradient cooling of atoms in a localized-hollow beam

In this paper, we propose a new scheme to cool and trap neutral ato ms by using a blue-detuned localized hollow beam (LHB), and studied the dynamica l process of intensity-gradient cooling of the trapped atoms in the LHB by means of Monte-Carlo simulations. Our study shows that an ultracold atomic sample wit h a temperature of ～5 μK and an atomic density of 1012—1013/cm 3 can be obtained in our single LHB, and this atomic density can be con trolled by changing the relative aperture of the lens system. So, such a LHB can be used to realize an all-optical atomic Bose-Einstein condensation.