Evaluation of optical parameters for a microminiature Rb vapor cell in a dual-beam SERF magnetometer

被引:15
作者
Wang, Yaxiang [1 ]
Shi, Tao [2 ]
Zhou, Weiyong [1 ,2 ]
Tang, JunJian [1 ]
Zhou, BinQuan [2 ,3 ]
Jin, Ge [2 ]
Han, Bangcheng [2 ,3 ]
Zou, Sheng [1 ,2 ,3 ]
机构
[1] Beihang Univ, Sch Instrumentat Sci & Optoelect Engn, Beijing 100191, Peoples R China
[2] Beihang Univ, Hangzhou Innovat Inst, Hangzhou 310051, Peoples R China
[3] Beihang Univ, Res Inst Frontier Sci, Beijing 100191, Peoples R China
基金
中国国家自然科学基金;
关键词
SPIN-EXCHANGE; ATOMIC MAGNETOMETER; MAGNETOENCEPHALOGRAPHY; FIELD;
D O I
10.1364/OE.458827
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
In the spin-exchange relaxation-free (SERF) magnetometer of a perpendicular pump-probe configuration, the pump and probe beam characteristics significantly affect the performance. In this paper, an efficient evaluation of optical parameters to improve the sensitivity of a miniature magnetometer has been presented. We have determined the pump light's optimal intensity and wavelength through theoretical analysis and the zero-field resonance experiments. Chirp signals are applied to measure the optical rotations at different probe intensities and frequencies. Through theoretical and experimental analysis of noise source characterization under different beam intensities and wavelengths, we demonstrate that dual-beam magnetometer performance is mainly limited by photon shot noise. Based on the optimum pump and probe beam parameters, we demonstrate magnetic field sensitivity of 6.3 fT/root Hz in an Rb-87 vapor cell filled with nitrogen gas, with an active measurement volume of 3 x 3 x 3 mm(3). (C) 2022 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement
引用
收藏
页码:23587 / 23599
页数:13
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