铷喷泉原子钟研究进展与实验改进
文献类型：学位论文
| 作者 | 周子超 |
| 学位类别 | 博士 |
| 答辩日期 | 2010 |
| 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 | 喷泉原子钟，稳定度，不确定度，二阶塞曼频移，调制转移光谱。 |
| 其他题名 | the rubidium atomic fountain clock and the experiment improvements |
| 中文摘要 | 本论文介绍了我们铷喷泉原子钟的研究进展以及实验上的改进，主要包括以下内容： 1，开展了国内第一台87Rb喷泉原子钟的研究，于2008年获得信噪比优于100，中心线宽为1Hz的Ramsey条纹。喷泉原子钟正常工作时，在1秒内捕获10^8个冷原子，原子团的温度为2μK，并且实现了喷泉原子钟的准连续运行。长时间闭环锁定后获得喷泉钟的阿兰方差为y（t）=8.1×10^-13t^-1/2 。在80000s后，频率稳定度达到5.6×10^-13 ； 2，利用天线辐射法测量了喷泉钟上自由飞行区的磁场分布，改进了C场线圈电流的稳定性。评估了二阶塞曼效应引起的频率偏移和产生的不确定度，结果表明在我们喷泉中上的二阶塞曼效应频移为2.01×10^-13，其不确定度为5.4×10^-16 ； 3，首次利用受激双光子Raman跃迁过程测量喷泉钟上自由飞行区的磁场分布，分析发现Doppler频移和光频移对磁场测量过程无影响并且在实验上得到验证。测试结果与天线辐射法相符合； 4，我们首先利用声光调制器实验上观测到了位于深度调制区域的调制转移光谱。并且发现在大的调制深度下(n<1)，由于高阶边带参与的四波混频过程，使得调制转移光谱的峰峰值和过零点处的梯度增加，可以提高调制转移光谱的稳频性能。 |
| 英文摘要 | This thesis presents the progress of our 87Rb atomic fountain clock and its improvements. The main contents are as followed: 1, we built the first 87Rb atomic fountain clock in China. In 2008, we attained the first Ramsey fringe which signal-to-noise ratio is better than 100 and the FWHM is 1Hz. Under normal operation condition, we can caperture about 109 cold 87Rb atoms which temperature is about 2μK. We realized the quasi-continuous operation of the atomic fountain clock. After compared with the hydrogen maser, the Allan standard deviation is y（t）=8.1×10^-13t^-1/2 . After 80000s, the frequency stability is about 5.6×10^-15; 2, we mearsured the magnetic map of the free flight zone in our atomic fountain clock through coupling the microwave with antenna, and then improved the current stability of the C-coil. We evaluated the second order Zeeman shift and its uncertainty of our atomic fountain clock. The result shows that the second order Zeeman shift is about 2.01×10^-13and its uncertainty is 5.4×10^-16； 3, We firstly measured the the magnetic map of the free flight zone in our atomic fountain clock through stimulated two-photon Raman transitions. This method is immune to the Doppler shift and the ac stark shift and we confirmed them in experiment. According to measured result, the second order Zeeman shift of our atomic fountain clock agrees with the result of the antenna method; 4, we firstly observed modulation transfer spectroscopy with Acoustic-Optic Modulator in the deep modulation regime. In this regime(n<1 ), the higher-order sidebands of pump beam are involved in the four-wave mixing processes which increase the gradient and peak to peak amplitude of the absorption and dispersion components. This advantage can be used to improve the performance of the locking laser. |
| 语种 | 中文 |
| 源URL | [http://ir.siom.ac.cn/handle/181231/15655]  |
| 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 | 周子超. 铷喷泉原子钟研究进展与实验改进[D]. 中国科学院上海光学精密机械研究所. 2010. |
入库方式： OAI收割
来源：上海光学精密机械研究所
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