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

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...

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Published in:Optics express 2022-06, Vol.30 (13), p.23587-23599
Main Authors: Wang, Yaxiang, Shi, Tao, Zhou, Weiyong, Tang, JunJian, Zhou, BinQuan, Jin, Ge, Han, Bangcheng, Zou, Sheng
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container_issue 13
container_start_page 23587
container_title Optics express
container_volume 30
creator Wang, Yaxiang
Shi, Tao
Zhou, Weiyong
Tang, JunJian
Zhou, BinQuan
Jin, Ge
Han, Bangcheng
Zou, Sheng
description 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/ Hz in an 87 Rb vapor cell filled with nitrogen gas, with an active measurement volume of 3 × 3 × 3 mm 3 .
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title Evaluation of optical parameters for a microminiature Rb vapor cell in a dual-beam SERF magnetometer
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