实现冷原子或冷分子囚禁的双层光阱列阵

Double-Layer Optical-Trap Arrays for Trapping Cold Atoms or Molecules

提出了一种新颖的实现冷原子或冷分子囚禁的双层光阱方案,它由二元π相位板列阵和会聚透镜列阵所组成,用平面光波通过此光学系统时将在透镜焦平面两侧形成双层光阱。介绍了产生双层光阱的基本原理,分析了光阱光强分布、强度梯度等与光学系统参数间的关系,研究了双层光阱囚禁原子(或分子)的光学偶极势和自发散射速率(包括瑞利散射和拉曼散射)等。该方案不仅可用于多样品原子(或分子)的光学囚禁及全光型玻色-爱因斯坦凝聚(BEC),而且可用于制备新颖的双层2D光学晶格。

A novel scheme of double-layer optical trap, which is composed of binary π-phase-plate arrays and focusing lens arrays, for trapping cold atoms or molecules was proposed. The double-layer optical trap is formed at the two sides of the focal plane when this optical system is illuminated by plane light wave. The principles of producing the double-layer optical trap were introduced and the relations between intensity distribution as well as intensity gradient and parameters of the optical system were analyzed in detail. Moreover, the optical dipole potential and spontaneous scattering speed, including Rayleigh scattering and Raman scattering, of the atoms or molecules trapped by double- layer optical trap were studied. The scheme can be used not only in trapping atoms or molecules of multiple samples and all optical Bose-Einstein condensation （BEC） ,but also in preparing novel double-layer 2D optical crystal lattice.