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题名	空间超冷原子物理地面系统真空及原子装载效率技术研究
作者	刘乾
文献子类	硕士
导师	汪斌
关键词	超高真空 UHV 二维磁光阱 Two-dimensional magneto-optical trap 光选态 Optical state preparation
其他题名	Study on Vacuum and Atomic Loading Efficiency of Space Ultra-cold Atomistic Physical Ground System
英文摘要	本学位论文介绍了作者在硕士期间的三项主要工作，包括基于空间超冷原子项目设计超高真空(UHV)系统，新型二维磁光阱（2D MOT）设计与模拟，以及基于空间冷原子钟原理样机光选态实验研究。 首先是基于空间超冷原子项目的超高真空系统设计。较之传统超冷原子实验升华泵加离子泵设计的体积、重量等问题，我们采取了吸气剂泵加离子泵的双泵方案。离子泵可以弥补吸气剂泵对惰性气体的抽速，吸气剂泵对活性气体有大抽速。经过计算完全可以符合〖10〗^(-9) Pa的实验要求。另外经过软件模拟，也验证了系统设计的可行性。 其次是新的二维磁光阱设计。新型二维磁光阱是在传统2D MOT加推送光基础上将推送光换成高斯光束。利用高斯光束的偶极力，来束缚长距离飞行的原子束的扩散，从而提高科学实验腔的装载效率。我们通过编写程序实现了对原子在新型二维磁光阱中运动的模拟，并评估新型2D MOT的效果。 另外是空间钟原理样机光选态实验研究。我们选择了光抽运的方案来进行选态实验研究。实验在固定抽运时间的前提下，分别研究了抽运光光强和失谐对抽运效率和有效原子数增益的影响，并且评估了由于选态光偏振不纯造成的σ跃迁对抽运效率的影响。; This thesis is mainly the author's three major tasks during the master's degree, including the design of ultra-high vacuum(UHV) system based on space ultra-cold atomic project, new two-dimensional magneto-optical trap(2D MOT) design and simulation, and the experimental study of the optical state preparation on the prototype of the space cold atom clock. The first is UHV system design. Considered with size and weight of the traditional Titanium sublimation pump ion pump double pump design of ultra-cold atomic experiment, we adopt the dual pump scheme of getter pump and ion pump. Ion pump can compensate inert gas pumping speed of getter pump. Getter pump has a large pumping speed on the active gas. The calculation can meet the requirements of 〖10〗^(-9) Pa. In addition, through software simulation, it also verifies the feasibility of the subsequent system design. The followed work is the new two-dimensional magneto-optical trap design. The new designed 2D MOT is based on a conventional 2D MOT plus Push Beam, which replaces Push Beam with a Gaussian Beam. Because of dipole force produced by the uneven optical field of the Gaussian Beam, the diffusion during the long distance flight of atom beam is bounded, which can improve the loading efficiency of the scientific experimental cavity. We also programmed the program to simulate the motion of atoms in the new two-dimensional magneto-optical trap, and evaluated the effect of the new 2D MOT. The other content of this paper is experimental study of the optical state preparation on the prototype of space clock. We selected the scheme of optical Pumping to carry out the relevant state preparation study. Based on a same pumping time，we studied the relationship between pumping efficiency，effective atomic number gain and Pumping intensity and detuning. We also evaluated the effect of σ transition，which is due to the impure polarization of the pumping light.
学科主题	光学工程
内容类型	学位论文
源URL	[http://ir.siom.ac.cn/handle/181231/31124]
专题	中国科学院上海光学精密机械研究所
作者单位	中国科学院上海光学精密机械研究所
推荐引用方式 GB/T 7714	刘乾. 空间超冷原子物理地面系统真空及原子装载效率技术研究[D].

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