<sup>87</sup>Rb冷原子转移及混合阱囚禁强场趋寻态原子
文献类型：学位论文
| 作者 | 韩景珊 |
| 学位类别 | 硕士 |
| 答辩日期 | 2012 |
| 授予单位 | 中国科学院上海光学精密机械研究所 |
| 导师 | 王育竹 |
| 关键词 | 冷原子转移 剩余振幅 混合阱囚禁 强场趋寻态 |
| 其他题名 | Transport of Cold 87Rb Atoms and Trapping of Strong Field Seekers with a Hybrid Trap |
| 中文摘要 | 冷原子转移技术在原子物理实验中起着非常重要的作用。本论文对冷原子转移作了全面的研究，并提出一种优化方案；在冷原子被绝热转移的基础上，我们小组实现了强场趋寻态原子的混合阱囚禁。 本论文给出了冷原子转移的理论模型，经过分析得出转移后原子团质心的剩余振幅为转移阱移动速度构型的傅立叶变换。由此，我提出并实验验证了一种冷原子非绝热转移的优化方案：给转移阱的速度构型加上调制。实验上，利用磁四极阱来转移87Rb原子，转移距离为22 mm，转移时间200 ms。当所加余弦调制周期数n = 5，调制深度K = 0.55，调制初相位φ = 0时，剩余振幅A从1.16 mm被降低至0.46 mm，同时被转移原子数增多为4.5×106，转移后原子团温度低为190 μK。基于磁四极阱，还实现了Tukey非绝热转移与Blackman型绝热转移。在利用Tukey速度构型非绝热转移冷原子时，我们观测到了原子团的分裂。 基于Blackman型绝热转移和调制转移技术，我们小组在实验上首次实现了初始状态为强场趋寻态的冷原子的混合阱囚禁。混合阱由四根平行导线和一个定匝线圈组成。四根导线通入射频电流产生射频场，在二维方向上约束原子；定匝线圈通入静电流，在线圈内部形成磁场极大值，从第三个方向上约束原子。实验上，给四根导线加上频率为10MHz，幅度为1.5A的射频电流，同时给定匝线圈加上0.2A的电流时，在实验上成功囚禁了强场趋寻态原子。 |
| 英文摘要 | Transport of cold atoms is very important in the development of experiments in atomic physics. This thesis investigated transport of cold atoms theoretically and experimentally; after adiabatic transport of the cold atoms, our group trapped the strong field seekers with a hybrid trap. Based on classic theory, this thesis gave a simple model for the transport of cold atoms. From the theory, residual amplitude of the atomic cloud’s mass center is the Fourier transform of velocity profile of the trap. And a new method of optimizing transport of cold atoms via modulating velocity profile imposed to a magnetic quadrupole trap was experimentally demonstrated. The trap potential velocity and the corresponding modulation were controlled by varying the currents of the two pairs of anti-Helmholtz coils. Cold 87Rb atoms were transported in a non-adiabatic regime over 22 mm in 200 ms by the magnetic trap with the modulation. With modulation periods n=5, modulation depth K=0.55 and initial phase φ=0, we efficiently transported cold atom clouds with more atom number (4.5×106), smaller amplitude of final vibration 0.46 mm, and lower temperature of the atom clouds (190 μK). Theory analysis and numerical simulation are also given which are good agreements with the experimental results. We also realized non-adiabatic transport of cold atoms with a Tukey velocity profile and adiabatic transport of cold atoms with a Blackman velocity profile. When using the Tukey velocity profile, the atomic cloud split. Based on the Blackman adiabatic transport of cold atoms, our group experimentally demonstrated trapping of strong field seekers with a hybrid trap. This hybrid trap was formed by four parallel conducts and a coil. The four parallel conducts, carrying a RF current, trapped the atoms in two dimensions; the coil, carrying a static current, trapped the atoms in another dimension. Experimentally, when adding a RF current with frequency 10MHz, amplitude 1.5A to the four conducts and adding a static current with amplitude 0.2A to the coil, we successfully trapped atoms in strong filed seeking state. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/16724]  |
| 专题 | 上海光学精密机械研究所_学位论文 |
| 推荐引用方式 GB/T 7714 | 韩景珊. <sup>87</sup>Rb冷原子转移及混合阱囚禁强场趋寻态原子[D]. 中国科学院上海光学精密机械研究所. 2012. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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