基于红失谐高斯光束的冷原子束流长距离传输  

Long-Distance Transmission of Cold Atomic Beams Based on Red-Detuned Gaussian Beams

作　　者：刘乾 谢昱 李琳[1,2] 梁昂昂 李文文 程鹤楠 方苏 刘亮 汪斌[1] 吕德胜[1] Liu Qian;Xie Yu;Li Lin;Liang Ang'ang;Li Wenwen;Cheng Henan;Fang Su;Liu Liang;Wang Bin;LüDesheng(Key Laboratory for Quantum Optics,Shanghai Institute of Optics and Fine Mechanics,Chinese Academy of Sciences,Shanghai 201800,China;College of Materials Science and Opto-Electronic Technology,University of Chinese Academy of Sciences,Beijing 100000,China)

机构地区：[1]中国科学院上海光学精密机械研究所量子光学重点实验室,上海201800 [2]中国科学院大学材料科学与光电技术学院,北京100000

出　　处：《光学学报》2021年第21期25-32,共8页Acta Optica Sinica

基　　金：国家自然科学基金(U1730126);中国科学院青年创新促进会资助课题。

摘　　要：提出了一种利用红失谐高斯光束偶极力实现二维磁光阱长距离传输冷原子束的方案。利用二能级原子所受散射力公式分析并构造了^(87)Rb原子在光偶极阱二维磁光阱(2D-ODT MOT)中的受力公式,考虑了原子与背景气体碰撞的影响,利用四阶龙格-库塔法求解原子运动方程,获得原子的运动轨迹,统计并求出原子在不同高斯光束失谐以及功率条件作用下进入差分泵浦范围的原子数。实验验证了在红失谐高斯光束与原子束推送光相互组合的4种工作状态下科学实验腔中磁光阱冷原子装载情况。理论与实验结果表明:基于红失谐高斯光束的二维磁光阱长距离传输冷原子束的效果提升显著,科学腔原子装载效率明显提升、原子数目明显增加。This paper presents a scheme for the long-distance transmission of cold atomic beams by two-dimensional magneto-optical traps based on the optical dipole force of red-detuned Gaussian beams.The scattering force equation of two-level atoms is used to analyze the forces on ^(87)Rb atoms in a two-dimensional magneto-optical trap with an optical dipole trap(2D-ODT MOT).In consideration of collisions of atoms with the background gas,the equations of atomic motion are solved by the fourth-order Runge-Kutta method and the trajectories of the atoms are obtained.The number of atoms entering the differential pumping range at different detunings of Gaussian beams and different powers is counted.Finally,the loading of cold atoms in magneto-optical traps of the science chamber is experimentally verified for four operating states in which the red-detuned Gaussian beam and the push light of atomic beams are combined.The theoretical and experimental results show that the 2D-ODT MOT based on the red-detuned Gaussian beam is effective in transmitting cold atomic beams over long distances.Both the loading efficiency and the number of atoms loaded in the science chamber are increased significantly.

关 键 词：原子与分子物理学 二维磁光阱 光偶极力 冷原子束 直接蒙特卡罗模拟 

分 类 号：O562[理学—原子与分子物理]