期刊
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
卷 72, 期 -, 页码 -出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TIM.2022.3224540
关键词
Counter-propagating beam; polarization; spin-exchange-relaxation-free (SERF) co-magnetometer; transverse optical pumping (TOP) of probe beam
This article establishes a model to quantitatively evaluate the polarization error in the output signal of a spin-exchange relaxation-free (SERF) co-magnetometer induced by transverse optical pumping (TOP). Based on this model, a novel fast measurement method for TOP is proposed, which utilizes steady-state response output signals and longitudinal polarization information. Furthermore, a method of suppressing TOP based on counter-propagating beam is suggested, effectively reducing the circular polarization-induced TOP by adjusting the phase retardation. The stability of the SERF co-magnetometer's outputs is improved, with a reduction in the coupling effect between probe beam power fluctuation and output signal bias.
The transverse optical pumping (TOP) introduced by a probe beam can result in a polarization error in the output signal of a spin-exchange relaxation-free (SERF) co-magnetometer. In this article, a model capable of quantitatively evaluating TOP in a SERF co-magnetometer is established based on three characteristics of the probe beam. According to this model, a novel fast measurement method for TOP based on steady-state response output signals and longitudinal polarization information is proposed. Furthermore, a method of suppressing TOP based on counter-propagating beam is suggested, and the circular polarization-induced TOP is effectively reduced by finely adjusting the amount of phase retardation of an octantal waveplate. Eventually, the counter-propagating beam scheme achieves a 22.74% TOP suppression ratio. The stability of both the short- and long-term outputs of the SERF co-magnetometer is improved and the lowest point of the Allan variance is 0.006 degrees/h better than the original. Moreover, the coupling effect between the probe beam power fluctuation and output signal bias of the SERF co-magnetometer is decreased.
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