铯原子喷泉钟冷原子粘团的制备及参数测量
发布时间：2019-01-25 19:05
【摘要】：铯原子喷泉钟作为复现“秒”定义的时间频率基准装置，具有最高的准确度性能，在航天航空、精密定位、基础物理、大地测量等领域有着广泛应用。铯原子喷泉钟是以冷原子粘团为工作介质。研究制备数目大、温度低的冷原子粘团是研制高性能铯原子喷泉钟的关键。原子跃迁几率的探测效率直接影响铯原子喷泉钟的性能。 本论文的研究内容围绕铯原子喷泉钟研制展开，包括应用慢速原子束制备冷原子粘团与铯原子喷泉钟探测区装置的设计和实现两部分。 1.分析了喷泉钟运行所需要真空度并提出设计方案，完成了真空系统，冷原子粘团制备区真空度优于1.6×10~(-7)Pa，，原子激励飞行区真空度优于3.8×10~(-7)Pa； 2.在激光系统的的设计和研制中，提出了激光扩束镜一体化设计方案，并完成了对冷却光特质的调校。实验获得了的冷原子粘团直径约6mm、数目(1.8±0.3)×10~8、温度10.72±0.69μK； 3.研究了不同实验参数对于冷原子粘团原子数目的影响，获得了最佳实验参数，激光失谐量-14.3MHz，激光功率8mW； 4.分析选择了双能级荧光探测法为原子跃迁几率探测方案，设计并实现了探测光学系； 5.研制了荧光收集系统，效率4%～5%； 6.实验获得了喷泉钟标志性信号——Ramsey干涉条纹。
[Abstract]:Cesium Fountain clock, as a time-frequency reference device for reappearing the definition of "second", has the highest accuracy performance and is widely used in aerospace, precision positioning, basic physics, geodesy and other fields. The caesium atomic fountain clock is a cold atomic agglomeration as the working medium. The preparation of large number and low temperature cold atomic adhesives is the key to the development of high performance cesium atomic fountain clock. The detection efficiency of atomic transition probability directly affects the performance of cesium atomic fountain clock. This paper focuses on the development of the cesium atomic fountain clock, including the design and implementation of the device for preparing the cold atomic cluster and the detecting area of the cesium atomic fountain clock using slow atomic beam. 1. The vacuum degree required for the operation of the fountain clock is analyzed and the design scheme is put forward. The vacuum degree of the cold atomic agglomeration preparation area is better than that of 1.6 脳 10 ~ (-7) Pa, atom excited flying area, and the vacuum degree of the cold atomic agglomeration region is better than 3.8 脳 10 ~ (-7) Pa; _ 2. In the design and development of laser system, the integrated design scheme of laser beam expander mirror is put forward, and the cooling light characteristic is adjusted. The experimental results show that the diameter of the cold atoms is about 6 mm, the number is (1.8 卤0.3) 脳 10 ~ (8), the temperature is 10.72 卤0.69 渭 K; The effects of different experimental parameters on the number of cold atoms are studied. The optimum experimental parameters are obtained: laser detuning (-14.3 MHz), laser power (8 MW; 4). The two-level fluorescence detection method is selected as the detection scheme of atomic transition probability, and the detection optical system is designed and implemented. 5. Developed a fluorescence collection system, the efficiency of 4 and 5; 6. Experimental results show that the signature signal of fountain clock, Ramsey interference fringe, is obtained.
【学位授予单位】：中国科学院研究生院(国家授时中心)
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：P127
本文编号：2415086
[Abstract]:Cesium Fountain clock, as a time-frequency reference device for reappearing the definition of "second", has the highest accuracy performance and is widely used in aerospace, precision positioning, basic physics, geodesy and other fields. The caesium atomic fountain clock is a cold atomic agglomeration as the working medium. The preparation of large number and low temperature cold atomic adhesives is the key to the development of high performance cesium atomic fountain clock. The detection efficiency of atomic transition probability directly affects the performance of cesium atomic fountain clock. This paper focuses on the development of the cesium atomic fountain clock, including the design and implementation of the device for preparing the cold atomic cluster and the detecting area of the cesium atomic fountain clock using slow atomic beam. 1. The vacuum degree required for the operation of the fountain clock is analyzed and the design scheme is put forward. The vacuum degree of the cold atomic agglomeration preparation area is better than that of 1.6 脳 10 ~ (-7) Pa, atom excited flying area, and the vacuum degree of the cold atomic agglomeration region is better than 3.8 脳 10 ~ (-7) Pa; _ 2. In the design and development of laser system, the integrated design scheme of laser beam expander mirror is put forward, and the cooling light characteristic is adjusted. The experimental results show that the diameter of the cold atoms is about 6 mm, the number is (1.8 卤0.3) 脳 10 ~ (8), the temperature is 10.72 卤0.69 渭 K; The effects of different experimental parameters on the number of cold atoms are studied. The optimum experimental parameters are obtained: laser detuning (-14.3 MHz), laser power (8 MW; 4). The two-level fluorescence detection method is selected as the detection scheme of atomic transition probability, and the detection optical system is designed and implemented. 5. Developed a fluorescence collection system, the efficiency of 4 and 5; 6. Experimental results show that the signature signal of fountain clock, Ramsey interference fringe, is obtained.
【学位授予单位】：中国科学院研究生院(国家授时中心)
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：P127
【参考文献】
相关期刊论文 前6条
1 陈伟亮;李天初;林弋戈;;NIM5喷泉钟冷却光注入系统的设计和调校[J];北京理工大学学报;2007年12期
2 李师群;激光冷却和捕陷中性原子[J];大学物理;1999年02期
3 付军贤,李义民,陈徐宗,杨东海,王义遒;一种测量磁光阱中冷原子密度和温度的新方法[J];光学学报;2001年04期
4 黄秉英,李天初,林平卫,李明寿,钱进,王平,干云清,辛明德,赵晓惠,陈伟亮;铯原子喷泉的飞行时间信号[J];中国激光;2003年12期
5 韩燕旭;王波;马杰;校金涛;王海;;冷原子EIT介质的原子数目和温度的测量[J];量子光学学报;2007年01期
6 董绍武;屈俐俐;李焕信;刘春侠;;NTSC的守时工作进展[J];时间频率学报;2010年01期
本文编号：2415086
本文链接：https://www.wllwen.com/kejilunwen/tianwen/2415086.html
