Mr. Jixi Lu Profile

Jixi Lu

at Beihang Univ

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Publications (4)

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Proceedings Article | 20 November 2024 Paper

In situ measurement of residual magnetic field in SERF atomic magnetometer based on transient response

Di Zhan, Yaoguo Wang, Jixi Lu

Proceedings Volume 13243, 1324304 (2024) https://doi.org/10.1117/12.3037606

KEYWORDS: Magnetism, Magnetometers, Time metrology, Polarization

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Maintaining a near-zero magnetic field condition is a requisite for atomic magnetometer under the spin-exchange relaxation-free (SERF) regime. Therefore, the precise determination of the residual magnetic fields is of great significance. Herein, we proposed an in-situ measurement method of residual magnetic fields in a dual-beam atomic magnetometer based on a transient response of the transverse polarization along the probe beam direction after switching off the pump beam. Proceeding from the Bloch equation, we established a complete evolution expression of the polarization vector under any static residual magnetic field with the pump beam switched off. On this basis, we analyzed the transient response of the transverse polarization by numerical simulation under different situations of residual magnetic fields. Besides, we also considered two possible conditions when the residual magnetic fields are relatively large or small, respectively. Accordingly, we presented an efficient and convenient estimation method of the residual magnetic fields based on certain time characteristics of the transient response. We verified the feasibility of our method by experiment and achieved a triaxial residual magnetic fields measurement within 0.5 s. This method can realize an in situ and real-time measurement of the residual magnetic fields in a fast and convenient way. Furthermore, this method can evaluate the effectiveness of different magnetic field compensation methods without introducing any modulation or extra devices.

Proceedings Article | 20 November 2024 Poster + Paper

An in situ measurement method of diffusion constant in SERF atomic magnetometer

Yaoguo Wang, Di Zhan, Xiujie Fang, Jixi Lu

Proceedings Volume 13241, 1324126 (2024) https://doi.org/10.1117/12.3037602

KEYWORDS: Diffusion, Magnetometers, Spin polarization, Chemical species, Beam diameter, Optical testing, Magnetism

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For SERF magnetometer, slow diffusion is one of the key operations required to achieve multi-channel and multi-axis measurement. Small diffusion distance over a polarization lifetime allows for the measurement of each separate region of a singular cell to be considered independent. Especially for multi-channel measurement, the spatial resolution is mainly limited by the diffusion distance, which is positively correlated to the diffusion constant. Therefore, the precise determination of the diffusion constant is significant for further optimization of the magnetometer’s spatial distribution and beneficial for improving the performance of spatial resolution. Herein, we proposed an in-situ measurement method of diffusion constant under large-scale cell condition in dual-beam magnetometer. With consideration of the diffusion effect, we established the distribution of polarization in the plane vertical to the pump beam. Then we analyzed the dependence of the optical rotation angle on the diffusion constant and the pump beam facular radius from both experiment and numerical simulation perspectives. Based on this, we realized the in-situ measurement of the diffusion constant through the detection of the optical rotation angle under different pump beam facular radii. In our experiment, we adopted a pump beam with great optical power to sufficiently polarize the alkali atoms and derive the diffusion constant at 1.6 cm2/s through formula fitting. This method can achieve an in-situ measurement of the diffusion constant and be generally applied to different cell conditions or measurement modes. Furthermore, it can provide guidance on further improvement in the spatial resolution of SERF magnetometer in multi-channel measurement, as well as the distribution of pump or probe beam in multi-axis measurement within a singular cell.

Proceedings Article | 29 December 2023 Paper

Detuned square-wave optical modulation zero-field atomic magnetometer

Xiaoyu Li, Bangcheng Han, Jixi Lu, Ziao Liu, Yifan Yan

Proceedings Volume 12975, 129750Y (2023) https://doi.org/10.1117/12.3015902

KEYWORDS: Modulation, Magnetism, Quantum magnetometry, Polarized light, Magnetometers, Alkali metals, Rubidium

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In recent years, arrayed atomic magnetometers have been continuously applied in biomagnetic scenarios. However, the crosstalk between adjacent sensors introduced by the modulated magnetic fields significantly compromises the imaging accuracy of arrayed atomic magnetometers. To solve this problem, a detuned square-wave optical modulation zero-field atomic magnetometer configuration is developed and we provide an analytical solution of this method. In this scheme, the circularly polarized pump light is used to polarize alkali metal atoms longitudinally, and a beam of detuned square-wave modulated circularly polarized light is applied transversely to generate a light-shift modulation instead of the coil-generated modulated magnetic field. Then the transverse magnetic field is measured by the optical absorption method of longitudinally circularly polarized pump light. This scheme maintains the inherent advantage of high sensitivity in spinexchange relaxation-free (SERF) atomic magnetometers. Additionally, the all-optical configuration eliminates the need for additional modulated magnetic fields or radio frequency (RF) fields, thereby mitigating crosstalk issues associated with modulated magnetic fields in array applications. Consequently, this scheme exhibits great potential for arraying and is expected to be employed in magnetocardiography (MCG) and magnetoencephalography (MEG).

Proceedings Article | 27 December 2022 Poster + Paper

Development of non-magnetic VCSEL module for compact atomic magnetometer

Quanpu Liu, Zhen Chai, Jixi Lu, Kaifeng Yin, Jianli Li

Proceedings Volume 12311, 123110U (2022) https://doi.org/10.1117/12.2643617

KEYWORDS: Magnetometers, Vertical cavity surface emitting lasers, Magnetism, Wave plates, Collimation, Polarization, Packaging, Optics manufacturing, Optical components

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The integrated Vertical-Cavity Surface-Emitting Lasers (VCSELs) modules have been widely researched and manufactured accompanying with the rapid development of compact atomic magnetometers, atomic gyroscopes, atomic clocks, and the other atomic sensors. For atomic magnetometers operating in the Spin-Exchange Relaxation-Free (SERF) regime, the vapor cell should be heated to a high temperature, which may cause the built-in laser chip over-heated and module structural or optical component deformation, lowering the performance of the built-in laser module. Meanwhile, due to the space constraints, the laser module needs to achieve a large collimation beam diameter and the non-magnetic structure should be optimized to have high temperature tolerance and stable thermal dissipation. In this study, a compact non-magnetic VCSEL module is developed based on the non-magnetic structure with the abilities of optical path alignment, beam collimation, and polarization conversion. Compared with the common TO-can packaging, the proposed VCSEL module achieved low residual magnetic field generated. And the entire volume is less than 1 cm3 with the collimating beam diameter of 2 mm. The experiment evaluation result shows that the laser module could work stably in high temperature with stable thermal dissipation and sufficient thermal margin (60±10℃) for precise wavelength tuning and maintain optical performance and structural for meeting the demand of pump laser in the SERF atomic magnetometers.

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