Journal
SENSORS AND ACTUATORS A-PHYSICAL
Volume 359, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.sna.2023.114467
Keywords
SERF co-magnetometer; Electron spin polarization; Frequency of probe light; Stabilization of detuned frequencies
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In this paper, a model of the polarization in relation to the probe light frequency for a hybrid pumping cell is established, and the existence of a theoretical optimum frequency is discovered. Experimental verification shows that the SERF co-magnetometer operates with significantly enhanced stability when operating at this optimization frequency. Based on this model, a detuned frequency stabilization technique is proposed, which improves the long-term stability of the probe light frequency.
Spin-exchange free-relaxation (SERF) co-magnetometer has promising applications in the field of inertial navigation and fundamental physics experiments since its coupled spin ensemble is capable of measuring rotation with ultra-high sensitivity. Electron spin polarization determines the performance of the SERF co-magnetometer directly. In this paper, it is found that there is a non-negligible coupling between the probe light frequency and electron spin polarization. A model of the polarization in relation to the probe light frequency for a hybrid pumping cell is established. This paper discovers the existence of a theoretical optimum frequency that enables a more stable polarization in the model, and an experimental verification is carried out. Experiments results show that when the SERF co-magnetometer operates at this optimization frequency, short-and long-term stability is significantly enhanced. Further, based on this model, the detuned frequency stabilization technique is proposed. The long-term stability of the probe light frequency is also improved by 43.85% after closing the loop.
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