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分布式反馈激光抽运铯磁力仪灵敏度相关参数研究
Study on sensitivity-related parameters of distributed feedback laser-pump ed cesium atomic magnetometer
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摘要: 本文报道了分布式反馈(简称DFB)激光抽运铯磁力仪实验系统，研究并优化了激光光强、激光频率、射频强度、铯吸收泡温度、吸收泡缓冲气体压强等5类参数，测算得到不同情况下铯原子塞曼跃迁谱谱线宽度?f与信噪比S/N的比值，并利用公式δB=1γCs?f S/N (γCs为铯原子旋磁比)将其转化为磁力仪灵敏度，得到最优灵敏度为2.5 pT/Hz1/2.实验表明，本文所研究的5类参数都会不同程度提高磁力仪灵敏度，其中，激光频率、射频强度、铯吸收泡温度更是将灵敏度提高了10倍以上，这为更高性能、实用化半导体激光抽运铯磁力仪的研制提供了重要参考.Abstract: This article reports a distributed feedback (DFB) laser-pumped cesium atomic experimental magnetometer, showing how the sensitivity is influenced by the following 5 kinds of parameters: laser light intensity, laser frequency, radiofre-quency intensity, temperature of cesium absorption cell, and the pressure of the buffer gas in the cell. Results of the experiments show that each of the five parameters has some influence on the sensitivity of the magnetometer, especially the laser frequency, radiofrequency intensity, and temperature of cesium absorption cell, which can even improve the sensitivity by 10 times. Recently we have obtained a sensitivity of 2.5 pT/Hz1/2.
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