重力光学势阱中消逝波冷却原子的蒙特卡罗研究

高伟建; 王文宝; 印建平; 王育竹

光学学报, 1999, 19 (12): 1585, 网络出版: 2006-08-09

重力光学势阱中消逝波冷却原子的蒙特卡罗研究

Study of Evanescent Light-Wave Cooling of Neutral Atoms in Gravitational Laser Trap with Monte-Carlo Simulation

论文大纲

高伟建 ¹王文宝 ¹印建平 ¹王育竹 ²

作者单位

¹ 苏州大学物理科学与技术学院分析测试中心, 苏州 215006

² 中国科学院上海光学精密机械研究所量子光学开放实验室, 上海 201800

原子冷却消逝波光场原子势阱 Sisyphus冷却蒙特卡罗模拟 atom cooling evanescent light-wave atom trap Sisyphus cooling Monte-Carlo simulations

摘要

讨论了三能级原子在消逝波光场作用下的Sisyphus冷却和几何冷却机制, 通过蒙特卡罗(Monte-Carlo)方法分别模拟了消逝波光场在方锥形势阱和圆锥形势阱两种情况下对原子冷却的动力学过程, 并计算了原子在不同的失谐量、激光功率及消逝波的判断宽度下的冷却情况。结果表明, 增大消逝波的激光功率能有效地减少原子的损耗, 但对冷却结果影响不大；而消逝波的判断宽度不够宽时, 结果偏差较大；对于方锥形势阱, 失谐量越小, 原子的最终温度也越低；在其它条件相同的情况下, 方锥形势阱比圆锥形势阱更有效, 原子能达到更低的温度和更高的密度, 因而在原子光学, 如原子干涉仪、原子激光等应用中更为有用。

Abstract

An efficient Sisyphus cooling and geometric cooling of three-level atoms in blue-detuned evanescent light-wave are discussed, and the kinetics processes of atom cooling in a pyramidal and conical hollow trap is studied by Monte-Carlo simulation.The results shows that (1) the atom-loss rate is decreased with the increase of evanescent-wave laser power, (2) the final equilibrium temperature of atoms in the pyramidal trap is decreased as the reduce of detuning δ, and (3) there is a larger error between the Monte-Carlo results and theoretically-estimated ones when the judged width of evanescent light-wave is not wide enough. In addition, under the same conditions, the pyramidal atom trap is more efficient than the conical atom trap, which can obtain a lower atomic temperature and higher atomic density.

参考文献

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高伟建, 王文宝, 印建平, 王育竹. 重力光学势阱中消逝波冷却原子的蒙特卡罗研究[J]. 光学学报, 1999, 19(12): 1585. 高伟建, 王文宝, 印建平, 王育竹. Study of Evanescent Light-Wave Cooling of Neutral Atoms in Gravitational Laser Trap with Monte-Carlo Simulation[J]. Acta Optica Sinica, 1999, 19(12): 1585.

重力光学势阱中消逝波冷却原子的蒙特卡罗研究

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