原子在圆锥形激光势阱中冷却效应的研究

本文讨论了在消逝波光场作用下，三能级原子在圆锥形光学势阱中的Ｓｉｓｙｐｈｕｓ 冷却和几何冷却机制，并通过 Ｍｏｎｔｅ－Ｃａｒｌｏ方法分别模拟了原子在不同形状（角度）的圆锥形 势阱和不同消逝波判断宽度下的冷却过程．结果表明，圆锥形角度越大，冷却原子的效果越好； 而消逝波的判断宽度不够宽时，模拟结果偏高．在其他条件相同的情况下，适当增大圆锥形势阱 的角度，能使原子达到更低的温度和更高的密度，因而在原子光学应用中更为有利。

STUDY OF COOLING OF NEUTRAL ATOMS IN CONICAL LASER TRAP

In this paper, an efficient Sisyphus cooling and geometric of three-level atoms in conical laser trap are investigated,and the processes of atom cooling is performed by Monte - Carlo simulation with different angles and judged widths. Our study shows that, (1)the final equilibrium temperature of atoms is decreased with the increase of angle, and (2)there is a larger error when the judged width of evanescent ligth-wave is not wide enough. In addition,under the same conditions, the larger angle of conical hollow trap is the more effcient,which can obtain a lower atomic temperature and higher atomic density.