基于相干布居囚禁的毫特级磁场测量方法研究

Research on Measurement Method of Milli Tesla Class Magnetic Field Based on Coherent Population Trapping

提出了一种基于相干布居囚禁原理的毫特级磁场测量方法,通过线偏振激光与^(87)Rb原子相互作用,得到磁场下因核自旋引起分裂的CPT共振信号,并根据分裂开的两个CPT共振信号进行磁场测量,该方法可以消除高次塞曼效应引起的非线性误差,从而提高磁场测量的准确度,可为量子化毫特级恒定磁场标准的建立提供了一种新的技术方案。

A method to measure milli tesla class magnetic field by coherent population trapping effect is proposed.Using linearly polarized laser to interact with^(87)Rb atoms,two divided CPT resonance signals caused by the nucleus spins in the magnetic field is obtained,and the magnetic induction strength of the magnetic field is derived by analyzing the splitting distance between the two CPT resonance signals.This method can eliminate nonlinear error caused by the high-order term to improve the accuracy of measuring the milli tesla class magnetic field and provides a new scheme for the quantum standard of milli tesla magnetic field.