Open AccessThree-Axis Atomic Magnetometer Employing Longitudinal Field Modulation
Author(s) -
Zhichao Ding,
Jie Yuan,
Guangfeng Lu,
Yingying Li,
Xingwu Long
Publication year - 2017
Publication title -
ieee photonics journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.725
H-Index - 73
eISSN - 1943-0655
pISSN - 1943-0647
DOI - 10.1109/jphot.2017.2743013
Subject(s) - engineered materials, dielectrics and plasmas , photonics and electrooptics
A three-axis atomic magnetometer employing longitudinal field modulation is demonstrated theoretically and experimentally. The operational condition of this magnetometer is that the longitudinal z-component of the external magnetic field is dominant, which is achieved by applying a bias magnetic field. The longitudinal z-component of the external magnetic field is extracted from the modulation frequency, which tracks the resonance frequency, and the transverse x - and y - components are, respectively, obtained from the quadrature and the in-phase signals of a lock-in amplifier. Through feedback control, the magnitude and direction of an external magnetic field can be measured in real time, and an excellent orthogonality of the three-axis magnetometer response is obtained. By optimizing the parameters of this three-axis magnetometer, a longitudinal field sensitivity of 0.3 ${\rm{pT}/ \rm{Hz}}^{1/ 2}$ ${\rm{pT}/ \rm{Hz}}^{1/ 2}$