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Two-stage digital differential atomic spin precession detection method
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DOI：10.1364/OE.443968.png)
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We propose and experimentally demonstrate a two-stage digital differential method for atomic spin precession detection. The first differential operation is carried out with a polarimeter module and subsequent digital differential. The second differential operation is achieved by orthogonally modulating the polarization direction of a linearly polarized probe light with a LiNbO3 electro-optic modulation module and by digitally demodulating the difference in the outputs corresponding to the positive and negative half periods of the modulation square-waves. This method is insensitive to the error of modulator and double sensitivity coefficient was obtained. The built detection system with the digital circuit was applied to a spin-exchange relaxation-free magnetometer, and the sensitivity coefficient, sensitivity, and bias instability were tested and compared with two other typical detection methods. The highest sensitivity and minimum bias instability and noise were achieved with the proposed method. (C) 2021 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement.
Keyword:
MAGNETOMETER
期刊
IF:
3.3
论文数:
6.1W
被引数:
14.3W
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引用论文
Probe noise characteristics of the spin-exchange relaxation-free (SERF) magnetometer.png)
OPTICS EXPRESSOAAI
OPTICS EXPRESSIF3.3
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