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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Bibliographic Details
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
Format: Article
Language:English
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Summary: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 .
ISSN:1094-4087
1094-4087
DOI:10.1364/OE.458827