光学学报, 2015, 35 (6): 0602002, 网络出版: 2015-04-20
铷原子横向弛豫时间的测量方法比较研究 下载: 506次
Comparative Research of Measuring Methods of Rubidium Atom Transverse Relaxation Time
原子与分子物理学 横向弛豫时间 磁共振 原子磁力仪 自由感应衰减 atomic and molecular physics transverse relaxation time magnetic resonance atomic magnetometer free induction decay
摘要
为测量短暂的碱金属原子横向弛豫时间,分析了改进了的自由感应衰减法、磁共振展宽拟合法以及旋转坐标系下的横向磁矩分量比值拟合法三种测量方法。并设计了实验装置,用这三种方法对10 μs 量级的铷原子横向弛豫时间进行了测量。测量结果表明,这三种方法的精度皆可达1 μs 量级。通过对这三种方法的测量环境分析,改进了的自由感应衰减法和比值拟合法的测量值可以直接作为一般的原子磁力仪的参数使用,展宽拟合法可以用于研究无光条件下的碱金属原子弛豫机制。
Abstract
In order to accurately measure the short transverse relaxation time of alkali-metal atoms, three measuring methods are analyzed, which are modified free induction decay method, broadening-fitting method of magnetic resonance response curve and ratio-fitting method of transverse component of the magnetic moment in the rotating coordinate system. The transverse relaxation time of rubidium atom vapor in a cell in the magnitude of 10 μs is measured with the above three methods. Experimental results show that these three methods can reach the precision in the magnitude of 1 μs . Through analyzing the experimental condition, the modified free induction decay method and ratio-fitting method can give accurate transverse relaxation time for atomic magnetometer. And broadening-fitting method can be used to research the relaxation mechanism without light.
丁志超, 袁杰, 李莹颖, 冯伟, 汪之国. 铷原子横向弛豫时间的测量方法比较研究[J]. 光学学报, 2015, 35(6): 0602002. Ding Zhichao, Yuan Jie, Li Yingying, Feng Wei, Wang Zhiguo. Comparative Research of Measuring Methods of Rubidium Atom Transverse Relaxation Time[J]. Acta Optica Sinica, 2015, 35(6): 0602002.