基于暗态扫频法的Rb-Xe自旋交换体系弛豫时间测量方法

在⁸⁷Rb-¹²⁹Xe自旋交换体系中，⁸⁷Rb和¹²⁹Xe弛豫时间的准确测量对于磁共振陀螺及磁力仪相关应用非常重要。针对该需求，分析了泵浦光与激励磁场对⁸⁷Rb弛豫时间的影响以及暗态下的⁸⁷Rb和¹²⁹Xe自旋交换过程，并在理论分析基础上提出了暗态扫频测量方法。实现了对⁸⁷Rb以及¹²⁹Xe的纵向弛豫时间的测量。使用本方法测得了⁸⁷Rb的横向弛豫时间和纵向弛豫时间分别为1.36和5.18 ms,¹²⁹Xe的纵向弛豫时间为519 s,其拟合R²=0.999 9,具有极高的拟合优度。相较于以往的测量方法，暗态扫频法可以彻底消除泵浦光造成的磁场梯度的影响，具有高准确度的优点且操作简便。研究对磁共振陀螺及磁力仪的性能分析与标定具有较高的参考价值。

Measurement method for relaxation time of Rb-Xe spin exchange system based on dark state sweeping method

In the87Rb-129Xe spin exchange system, the accurate measurement of the relaxation times of87Rb and129Xe is crucial forapplications related to nuclear magnetic resonance gyroscopes and magnetometers. In response to this requirement, the influences ofpump light and excitation magnetic field on87Rbrelaxation time, as well as the spin exchange processes of87Rb and129Xe in the darkstate, are analyzed. Based on theoretical analysis, a dark state sweep frequency measurement method is proposed. The measurement oflongitudinal relaxation time of87Rb and129Xe is achieved. The transverse relaxation time and longitudinal relaxation time of87Rbmeasured using this method are 1. 36 and 5. 18 ms, respectively. The longitudinal relaxation time of129Xe is 519 s, whose R-squared is0. 999 9 which has a very high goodness of fit. Compared with previous measurement methods, the dark state sweep method cancompletely eliminate the influence of magnetic field gradient caused by pump light, and has the advantages of high accuracy and easyoperation. This article has high reference value for the performance analysis and calibration of nuclear magnetic resonance gyroscopes andmagnetometers.