Application of nuclear spin maser of a new scheme to the experimental study of atomic electric dipole moment

为了实现对129Xe原子违反CP的永久电偶极矩(EDM)的高灵敏度探测，构建了一种基于光学自旋探测和外反馈机制的核自旋脉泽新方案。对其信号性能和频率稳定度进行了详细的研究和改进，在单次测量30,000 S持续时间的情况下，频率精度为7.9nHz。此外，还将~3He作为参考自旋体系加入到~(129)Xe磁化物质中，发展了同时极化、保存和检测这两个自旋物种的技术。实现了129Xe-3He两种核自旋激射器的同步工作，实现了对磁场漂移产生的杂散电火花信号的精确去除，为实现129Xe的高精度电火花加工检测奠定了仪器和技术基础。

In order to pursue a high sensitivity detection of the CP-violating permanent electric dipole moment (EDM) of 129Xe atom, a nuclear spin maser of new scheme which runs on the basis of optical spin detection and external feedback mechanism was constructed. Detailed investigations and improvements of its signal performance and frequency stability were carried out, yielding a frequency precision of 7.9 nHz for a one shot measurement of 30,000 s duration. Furthermore, 3He were added as a reference spin system to the 129Xe masing substance, and the technique to polarize, preserve and detect the two spin species simultaneously was developed. As a result, the simultaneous operations of the 129Xe-3He two species nuclear spin maser, which allows the precision removal of spurious EDM signals arising from drifts in the magnetic field, was realized, and thus the instrumental and technical basis for executing the projected high-precision EDM detection in 129Xe was established.