Suppression of ambient temperature-caused drift in a laser power stabilization system with a liquid crystal variable retarder in atomic gyroscopes

Niu, Yue; Duan, Lihong; Zhang, Jingxin; Huang, Jiong; Zhai, Yueyang; Quan, Wei

doi:10.1063/5.0049994

Cited by 3 publications

(1 citation statement)

References 19 publications

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“…However, this method can only effectively control the in-loop laser power, leaving the out-of-loop laser power with significant fluctuations and drifts. [21,22] As the stability of the out-of-loop laser power is much worse than that of the in-loop one, a few papers have reported specific analyses and solutions. The authors in Ref.…”

Section: Introductionmentioning

confidence: 99%

Suppression of laser power error in a miniaturized atomic co-magnetometer based on split ratio optimization

Zhang

Fan

et al. 2023

Chinese Phys. B

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A miniaturized atomic spin-exchange relaxation-free (SERF) co-magnetometer measures angular velocity using a balanced polarimetry technique which is easily affected by the laser power. A laser power closed-loop control system is usually used to suppress the fluctuation of the laser power. Although this method can greatly eliminate the fluctuation of the in-loop laser power (the feedback laser), it cannot fully eliminate the fluctuation of the out-of-loop laser power (the signal measurement laser). This leads to SERF gyroscope laser power error, which reduces the inertial measurement accuracy. In this paper, the influence mechanism of the split ratio (the ratio of the in-loop laser power to the out-of-loop laser power) on the out-of-loop laser power control accuracy is analyzed by establishing a laser power transmission model inside and outside the loop. Moreover, a method is developed to improve the out-of-loop laser power stability by optimizing the split ratio. Comparative experiments showed that the relative Allan standard deviation of the out-of-loop laser power decreased from 5.48×10-6 to 2.62×10-6 at 100 s, and decreased by an order of magnitude from 1.76×10-5 to 3.30×10-6 at 1000 s. Correspondingly, the rate ramp coefficient in the Allan standard deviation curve of the SERF gyroscope test data decreased from 1.312 °/h/h to 0.246 °/h/h. And the bias stability increased from 0.032 °/h to 0.019 °/h. Therefore, the proposed method can improve the long-term stability of the probe laser power and effectively suppress the laser power error of the SERF gyroscope.

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Section: Introductionmentioning

confidence: 99%

Suppression of laser power error in a miniaturized atomic co-magnetometer based on split ratio optimization

Zhang

Fan

et al. 2023

Chinese Phys. B

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Suppression of thermal coupling noise in the SERF atomic co-magnetometer

Ruan,

Duan,

et al. 2023

Results in Physics

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Atomic spin precession detection method based on the Mach-Zehnder interferometer in an atomic comagnetometer

zhang¹,

Duan²,

Fan³

et al. 2022

Opt. Express

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A new method for the detection of atomic spin precession based on the Mach-Zehnder interferometer (MZI) is proposed and experimentally demonstrated. Different from the conventional polarization detection methods which obtain the atomic spin precession signal by measuring the change of the probe laser power, the proposed method uses the laser modulated by an electro-optic phase modulator (EOM) as the source of the interferometer, and obtains the atomic spin precession signal by measuring the phase difference between the two arms of the MZI. The output of interferometer is independent of the probe laser power, which avoids the system error caused by the fluctuation of the probe laser power, and the long-term stability of the system is effectively improved. At the same time, the method adopts high-frequency electro-optic modulation, which can effectively suppress low-frequency noise, such as 1/f noise, and can significantly improve the detection sensitivity. The rotation sensitivity and long-term stability of the atomic comagnetometer were tested using the MZI detection method and a typical detection method, respectively. The comparison results show that the proposed method has the highest low frequency sensitivity and the potential to improve the long-term stability of the system.

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Suppression of ambient temperature-caused drift in a laser power stabilization system with a liquid crystal variable retarder in atomic gyroscopes

Cited by 3 publications

References 19 publications

Suppression of laser power error in a miniaturized atomic co-magnetometer based on split ratio optimization

Suppression of laser power error in a miniaturized atomic co-magnetometer based on split ratio optimization

Suppression of thermal coupling noise in the SERF atomic co-magnetometer

Atomic spin precession detection method based on the Mach-Zehnder interferometer in an atomic comagnetometer

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