冷原子或冷分子囚禁的可控制光学双阱

提出了一种采用单光束照明二元π相位板与透镜组合系统产生的适用于冷原子与分子囚 禁的可控制光学双阱方案.计算了双阱的光强分布，研究了双阱到单阱的演化过程，并导出了双阱几何参数、光强分布、强度梯度及其曲率与光学系统参数间的解析关系.研究发现， 通过相对移动二元相位板可实现光学双阱到单阱的连续双向演化，得到了双阱间距与相位板移动距离的关系.该方案不仅简单可行、操作方便，而且在原子物理、原子光学、分子光学和量子光学领域中有着广阔的应用前景. 关键词： 二元相位板 可控制光学双阱 原子囚禁 原子光学 分子光学

Controllable double-well optical trap for cold atoms or molecules

In this paper, we propose a novel scheme to form a controllable double well opt i cal trap for cold atoms or molecules by using a system composed of a binary π phase plate and a lens illuminated by a plane light wave. We calculate the int ensi ty distribution of the double well trap, and study the evolution process of th e optical trap from two wells to a single well, and derive the analytical relation between the characteristic parameters of the double well trap (includi ng g eometric parameters, the intensity distributions, intensity gradients and their curvatures) and the parameters of optical system. We find that our double well trap can be continuously changed into a single well trap by moving the π phas e pl ate along the x direction, and the relation between the distance of the trap ping centers of the two wells and the moving distance of the π phase plate is obt ain ed by data fitting. In addition, our double well scheme is not only simple and c onvenient, but also has some important and wide applications in the fields of at omic physics, atom optics, molecule optics and quantum optics and so on.