SERF原子自旋惯性测量耦合系综响应模型研究  

Research of Coupled Ensemble Response Model in SERF Comagnetometers

作　　者：徐子童 魏凯 翟跃阳[2,3] 全伟 房建成 Xu Zitong;Wei Kai;Zhai Yueyang;Quan Wei;Fang Jiancheng(School of Instrumentation and Optoelectronic Engineering,Beihang University,Beijing 100191,China;Institute of Extremely-Weak-Magnetic-Field Massive Scientific Instrumentation Facility,Hangzhou 310051,Zhejiang,China;Institute of Large-Scale Scientific Facility,Beihang University,Beijing 100191,China)

机构地区：[1]北京航空航天大学仪器科学与光电工程学院,北京100191 [2]杭州极弱磁场重大科技基础设施研究院,浙江杭州310051 [3]北京航空航天大学大科学装置研究院,北京100191

出　　处：《中国激光》2022年第19期3-10,共8页Chinese Journal of Lasers

基　　金：国家自然科学基金杰出青年基金(61925301);中国博士后科学基金(2021M700345)。

摘　　要：无自旋交换弛豫(SERF)原子自旋惯性测量装置在前沿基础物理探索以及惯性导航领域具有广泛应用前景。建立了SERF原子自旋惯性测量装置的耦合系综动力学响应模型,通过仿真和实验量化分析了耦合系综动力学响应的影响因素,厘清了偏置磁场、耦合自旋系综极化率和弛豫率等因素对准静态响应信号的影响。发现在强耦合点与自补偿点处,动态响应速度存在75倍的显著差异。进一步分析了偏置磁场、极化率和弛豫率对不同原子组合的惯性测量装置响应系数的影响。发现在自补偿点处存在最优极化率,使惯性测量装置的角速度响应系数最高,此最优点与原子种类和电子自旋弛豫率相关,可以通过降低电子自旋弛豫率将角速度响应系数提升近1倍。明确了通过优化电子自旋极化率和抑制电子自旋弛豫率可以进一步提升SERF原子自旋惯性测量灵敏度和动态性能,有望拓展其在惯性导航和基础物理探索中的应用。Objective Spin-exchange relaxation-free(SERF)comagnetometers have been widely applied in fundamental physics exploration,including the fifth force measurement,dark matter detection(axion and axion-like particles)and CPT(charge conjugation,parity inversion,time reversal)and Lorentz symmetry violations.Besides,it has an internationally recognized development potential in inertial navigation.SERF comagnetometers contains alkali metal electronic spin ensemble and noble gas nuclear spin ensemble.The study of the responses to external excitations inevitably involves the coupling of two ensembles.A general response model for K-^(3)He comagnetometer has been introduced to characterize the dynamics of the hybrid pumping K-Rb-^(21)Ne comagnetometer.However,there are significant differences between the two kinds of spin ensembles combinations.The unexplored comparison of dynamics between the two spin ensembles combinations would present fruitful discoveries.In this paper,we establish a complete model for K-Rb-^(21)Ne comagnetometer and compare the responses of K-^(3)He and K-Rb-^(21)Ne comagnetometers.The influencing factors of the response rate and the amplitude are quantified.This research sheds light on the study of the difference between different spin ensembles combinations for the improvement of the dynamic performance and sensitivity of comagnetometers,and is expected to promote the development of inertial navigation and fundamental physics exploration.Methods In this paper,transient and steady-state response models are established from the Bloch equations that describe the coupling of electronic and nuclear spins.In the K-Rb-^(21)Ne comagnetometer,the electronic effective magnetic field cannot be ignored,so the spin exchange relaxation rate is considered in the model.Based on the established model,the influence of various influencing factors on the dynamic response is analyzed.For the transient response,the main influencing factor is the bias magnetic field.The dynamic responses to the magnetic field,angular velocit

关 键 词：测量 无自旋交换弛豫 惯性测量装置 原子自旋耦合系综 动力学响应模型 自补偿 

分 类 号：O562[理学—原子与分子物理]