Acta Physica Sinica, Volume. 68, Issue 9, 090701-1(2019)
Magnetometry has already been widely used in mineral exploration, medical exploration and precision measurement physics. One is trying to improve the sensitivity of the magnetometer. One of the most widely used magnetometers is based on the Bell-Bloom structure, which can be realized by modulating the pump light. The sensitivity of the Bell-Bloom magnetometer is determined by the magnetic resonance linewidth (MRL) and the signal-to-noise under the condition of magnetic resonance (SNR). Both are affected by the pump intensity and the relaxation rate of the atoms. In order to achieve a higher sensitivity, how these factors affect the magnetic field measurement should be analyzed. In this paper, the influence of the pump light on the sensitivity of the linearly polarized Bell-Bloom magnetometer is investigated based on the Bloch equation with amplitude modulated pump beam and the rate equations with spin relaxation. The rate equations are obtained from the Liouville equation, and the theoretical analysis is based on the cesium. The pump beam is linearly polarized and is resonant to D1 transition of cesium. Both the direct pump (pump frequency is resonant to
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Chen Yang, Guan-Hua Zuo, Zhuang-Zhuang Tian, Yu-Chi Zhang, Tian-Cai Zhang.
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Received: Jan. 6, 2019
Accepted: --
Published Online: Oct. 29, 2019
The Author Email: Zhang Tian-Cai (tczhang@sxu.edu.cn)