Optical molasses and multilevel atoms: theory
Optical molasses and multilevel atoms: theory
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DOI：
10.1364/josab.6.002058
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发表时间：
1989-11
影响因子：
1.9
通讯作者：
P. Ungar;D. Weiss;E. Riis;S. Chu
中科院分区：
文献类型：
--
作者：
P. Ungar;D. Weiss;E. Riis;S. Chu
本文对存在极化梯度的含磁子能级的二能级原子的激光冷却进行了理论分析。数值求解了一维光学糖蜜中四种偏振态组合的多级系统的光学布洛赫方程。在没有极化梯度的情况下，恢复了由简单的二能级理论给出的原子上的光压力，而发现极化的空间变化导致慢原子的强冷却力。增加的冷却力是最近观察到的原子在光学糖蜜中冷却到低于多普勒极限一个数量级的温度的原因。
A theoretical analysis is given for laser cooling of a two-level atom with magnetic sublevels in the presence of polarization gradients. The optical Bloch equations for the multilevel system are solved numerically for four combinations of polarizations in one-dimensional optical molasses. The light-pressure force on the atom as given by a simple two-level theory is recovered in the absence of polarization gradients, whereas a spatial variation of the polarization is found to lead to a strong cooling force for slow atoms. The increased cooling force is responsible for the recent observations of atoms cooled in optical molasses to temperatures an order of magnitude below the Doppler limit.