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154 results on '"Lu, Jixi"'

12. Femtotesla all-optical dual-axis spin-exchange relaxation-free magnetometer.

Author

Li, Xiaoyu, Han, Bangcheng, Liu, Ziao, Wang, Zhongyu, Sheng, Jianwei, Xiang, Min, and Lu, Jixi

Subjects
MAGNETOMETERS, OPTICAL modulation, OPTICAL pumping, CONDUCTION electrons
Abstract

The sensitivity of existing all-optical atomic magnetometers is significantly compromised due to the simultaneous influence of optical parameters on both optical pumping and optical modulation of atoms. The tight interlinkage of these processes poses challenges for their individual optimization, thereby restricting the achievable sensitivity. To address this issue, we developed a comprehensive optical modulation analytical model that fully considers the effects of dynamic optical pumping. Building upon this model, we introduced a multi-objective optimization method for optical parameters, leading to minimal non-sensitive axis crosstalk and optimal sensitivity. Experimental results demonstrated a femtotesla all-optical spin-exchange relaxation-free magnetometer with sensitivities of 2 fT/Hz1/2 along the y-axis and 4 fT/Hz1/2 along the x-axis, respectively. This advancement surpasses the sensitivity of existing optically modulated magnetometers and bears profound implications for the advancement and application of arrayed magnetometers. [ABSTRACT FROM AUTHOR]

Published
2024
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24. Suppression of Magnetic Noise and Field in Cubic Low-Noise Ferrite Magnetic Shields

Author

Sun, Bowen, Ma, Danyue, Fang, Xiujie, Xue, Yangzhi, Lu, Jixi, Chen, Hua, Zhang, Mengshi, Wei, Huanqi, Han, Bangcheng, and Zhai, Yueyang

Abstract

Most magnetic shielding rooms (MSRs) are made of highly permeable permalloy. The limitation of such MSR is its intrinsic magnetic noise, which exceeds the sensitivity of magnetic sensors, impeding the further applications of ultrasensitive magnetic sensors, such as the magnetometers operated in the spin-exchange relaxation free (SERF) regime. In this article, a cubic ferrite magnetic shield with a low magnetic noise and magnetic field is proposed. The demagnetization model and magnetic noise calculation models are given. After optimizing several different coil structures and degaussing parameters, the magnetic field and the magnetic noises inside the cubic ferrite shield were measured. Within a distance of ±10 mm near the center, the residual magnetic field is below 0.5, 1.72, and 1.57 nT at the x-, y- and z- directions. The magnetic noise measurements at the center of the cubic ferrite magnetic shield reveal an averaged magnetic noise of 2.62 fT/Hz−1/2 from 20 to 100 Hz. Compared with the noise spectrum of permalloy shield, the noise level is reduced more than 133%. The results of this scaled-down cubic ferrite magnetic shield can be applied in larger sized shielding rooms. By assembling multiple ferrite panels together, it is possible to create a larger shielding space with a low magnetic field and low magnetic noise.

Published
2024
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25. Optical Parameter Decoupling and Optimization for Elliptically Polarized Atomic Magnetometer

Author

Yan, Yifan, Zhang, Shaowen, Liu, Zehua, Zhan, Di, Liu, Ziao, Li, Xiaoyu, Zhou, Ying, and Lu, Jixi

Abstract

Elliptically polarized atomic magnetometers (AMs) offer high sensitivity and compactness by using a single laser beam to polarize atoms and detect optical rotation angles. However, their sensitivity advantage over optical absorption-based AMs has not been sufficiently demonstrated. This is because the optical parameters significantly affect the pumping and probing processes, leading to parameter coupling when both processes are optimized simultaneously. Such coupling presents a considerable challenge for achieving simultaneous parameter optimization, ultimately limiting the achievable sensitivity. In this study, we developed a modified input–output model for a magnetometer, based on which an optical parameter decoupling and optimization method is proposed. Our method enables us to obtain the optimal optical parameters simultaneously, including the ellipticity, intensity, and frequency of light. Consequently, a sensitivity of 6 fT/Hz1/2 was achieved using a $4\times 4\times4$ mm3 87Rb vapor cell (an effective volume of 0.027 cm3). This work offers an efficient strategy to achieve higher sensitivity using single-beam miniaturized AMs, contributing significantly to promote biomagnetism research.

Published
2024
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