Zhao Tian, Zhai Yueyang, Liu Chang, Xie Hongtai, Cao Qian, Fang Xiujie
Opt Express. 2022 Jul 18;30(15):28067-28078. doi: 10.1364/OE.463651.
We investigate the effects of the density ratio of K-Rb hybrid cells on the alkali metal-noble gas comagnetometers. Bloch equations simplified with the density ratio and average-pumping-rate model are presented for numerical simulation, which simplifies equations of complete hybrid spin ensemble and problem of polarization gradient. The spin polarizations of electron and nucleon, total electronic relaxation rates, and the spin-exchange efficiencies are measured with cells of different density ratios. The results are in good agreement with our equivalent model. Based on our theoretical analysis, the K-Rb-Ne comagnetometer achieves maximum output signal by optimizing the combination of density ratio and optical power density. The density ratio is critical to the homogeneity of spin polarization and efficiency of hyperpolarization. The method in this work finds a way to optimize the sensitivity of comagnetometers, which is significant for angular-rotation sensors and new physics research.
我们研究了钾 - 铷混合细胞的密度比在碱金属 - 稀有气体共磁强计中的作用。提出了用密度比和平均抽运率模型简化的布洛赫方程用于数值模拟，这简化了完整混合自旋系综的方程以及极化梯度问题。使用不同密度比的细胞测量了电子和核子的自旋极化、总电子弛豫率以及自旋交换效率。结果与我们的等效模型吻合良好。基于我们的理论分析，钾 - 铷 - 氖共磁强计通过优化密度比和光功率密度的组合实现了最大输出信号。密度比对自旋极化的均匀性和超极化效率至关重要。这项工作中的方法找到了一种优化共磁强计灵敏度的途径，这对角旋转传感器和新物理研究具有重要意义。
