Ms. Jing Wang Profile

Jing Wang

at Beihang Univ.

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Publications (4)

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Proceedings Article | 5 November 2020 Paper

A zero-field atomic gradiometer with elliptically polarized laser-pumped used for biomagnetic measurement

Kaifeng Yin, Jing Wang, Zhi Liu, Yeguang Yan, Huining Shang, Binquan Zhou

Proceedings Volume 11564, 115640L (2020) https://doi.org/10.1117/12.2579712

KEYWORDS: Magnetism, Magnetometers, Modulation, Polarization, Magnetic sensors, Sensors, Environmental sensing, Wave plates

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A new design of compact zero-field atomic gradiometer was proposed and integrated using alkali vapor cell and customized optical components. This gradiometer used two parallel elliptically polarized lights, whose output intensity was measured to perform gradient magnetic field detection, respectively. To improve the gradiometer’s sensitivity of the magnetic field detection, the gradiometer was operated in the spin-exchange relaxation-free (SERF) regime. For the sensitivity study, the gradiometer was placed in a person-sized four-layer μ-metal magnetic shielding. With the magnetic shield closed up, the sensitivity of each channel was near 34 fT/ √ Hz, and the corresponding gradient sensitivity could reach 14 fT/√ Hz/cm on a 1cm baseline. When the cover of magnetic shielding was removed, the magnetometer sensitivity of single channel was about 90 fT/√ Hz, and the corresponding gradient sensitivity could reach 34 fT/√ Hz/cm. The experimental results implied that in a poor magnetic shielding environment, the performance of magnetometer was limited due to the fluctuations of the environmental magnetic field, while the gradiometer could work well.

Proceedings Article | 5 November 2020 Paper

Study on temperature fluctuation measurement in alkali vapor cell

Huining Shang, Kaifeng Yin, Tao Shi, Yan Yin, Jing Wang, Yeguang Yan, Binquan Zhou, Heng Yuan

Proceedings Volume 11566, 115660M (2020) https://doi.org/10.1117/12.2580060

KEYWORDS: Temperature metrology, Absorption, Potassium, Magnetometers, Absorption spectroscopy, Quantum physics, Optical simulations

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Recent developments in the exploration of atomic spin instrumentation have enabled the atomic magnetometer to become the most effective detector of magnetic fields. The stability of temperature in alkali vapor cells is an important factor for ensuring the measurement accuracy of atomic magnetometers. The alkali vapor cell is usually heated to 80°C ∼ 190°C. During the heating process, although the heating system reaches a steady state, the temperature inside the alkali metal cell will still fluctuate, which will affect the accuracy of the device measurement. In this paper, K cells were simulated and analyzed by using the theory of atomic absorption spectroscopy theory. By the mathematical relationship models, the simulation analysis of the cell containing alkali vapor found that, within a small temperature fluctuation range (±1°C), the temperature fluctuation of the alkali vapor cell filled with buffer gas and the broadening parameter of the atomic absorption spectrum, as well as the frequency shift parameter all show a linear relationship. In order to facilitate the actual measurement, the relationship between the detection light intensity transmitted through the alkali metal cell and the temperature fluctuation inside the cell was also analyzed in this paper. Through simulation analysis, it is found that, within a small temperature fluctuation range (±1°C), the linear relationship between the detected light intensity transmitted through the alkali vapor cell and the temperature fluctuation inside the cell also exists.

Proceedings Article | 24 October 2017 Paper

Study on VCSEL laser heating chip in nuclear magnetic resonance gyroscope

Xiaoyang Liang, Binquan Zhou, Wenfeng Wu, Yuchen Jia, Jing Wang

Proceedings Volume 10457, 104572O (2017) https://doi.org/10.1117/12.2284919

KEYWORDS: Magnetism, Gyroscopes, Vertical cavity surface emitting lasers, Microelectromechanical systems

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In recent years, atomic gyroscope has become an important direction of inertial navigation. Nuclear magnetic resonance gyroscope has a stronger advantage in the miniaturization of the size. In atomic gyroscope, the lasers are indispensable devices which has an important effect on the improvement of the gyroscope performance. The frequency stability of the VCSEL lasers requires high precision control of temperature. However, the heating current of the laser will definitely bring in the magnetic field, and the sensitive device, alkali vapor cell, is very sensitive to the magnetic field, so that the metal pattern of the heating chip should be designed ingeniously to eliminate the magnetic field introduced by the heating current. In this paper, a heating chip was fabricated by MEMS process, i.e. depositing platinum on semiconductor substrates. Platinum has long been considered as a good resistance material used for measuring temperature The VCSEL laser chip is fixed in the center of the heating chip. The thermometer resistor measures the temperature of the heating chip, which can be considered as the same temperature of the VCSEL laser chip, by turning the temperature signal into voltage signal. The FPGA chip is used as a micro controller, and combined with PID control algorithm constitute a closed loop control circuit. The voltage applied to the heating resistor wire is modified to achieve the temperature control of the VCSEL laser. In this way, the laser frequency can be controlled stably and easily. Ultimately, the temperature stability can be achieved better than 100mK.

Proceedings Article | 24 October 2017 Paper

Intensity and frequency stabilization of a laser diode by simultaneously controlling its temperature and current

Weiwei Mu, Zhaohui Hu, Jing Wang, Binquan Zhou

Proceedings Volume 10457, 1045728 (2017) https://doi.org/10.1117/12.2284786

KEYWORDS: Laser stabilization, Semiconductor lasers, Feedback control

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Nuclear magnetic resonance gyroscope (NMRG) detects the angular velocity of the vehicle utilizing the interaction between the laser beam and the alkali metal atoms along with the noble gas atoms in the alkali vapor cell. In order to reach high precision inertial measurement target, semiconductor laser in NMRG should have good intensity and frequency stability. Generally, laser intensity and frequency are stabilized separately. In this paper, a new method to stabilize laser intensity and frequency simultaneously with double-loop feedback control is presented. Laser intensity is stabilized to the setpoint value by feedback control of laser diode’s temperature. Laser frequency is stabilized to the Doppler absorption peak by feedback control of laser diode’s current. The feedback control of current is a quick loop, hence the laser frequency stabilize quickly. The feedback control of temperature is a slow loop, hence the laser intensity stabilize slowly. With the feedback control of current and temperature, the laser intensity and frequency are stabilized finally. Additionally, the dependence of laser intensity and frequency on laser diode’s current and temperature are analyzed, which contributes to choose suitable operating range for the laser diode. The advantage of our method is that the alkali vapor cell used for stabilizing laser frequency is the same one as the cell used for NMRG to operate, which helps to miniaturize the size of NMRG prototype. In an 8-hour continuous measurement, the long-term stability of laser intensity and frequency increased by two orders of magnitude and one order of magnitude respectively.

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