摘要
全光铯(Cs)原子磁力仪是一种高灵敏度弱磁检测仪,核心器件Cs原子气室的工作温度直接决定了原子磁力仪的灵敏度。实验系统中采用频率锁定在Cs原子D1线F=3→F′=4共振线的圆偏振光极化Cs原子,检测光采用频率锁定在Cs原子D2线F=4→F′=5共振线的线偏振光,检测介质的圆二向色性。实验发现,随着Cs原子气室工作温度的升高,磁力仪输出信号幅度先增加然后逐渐衰减,而磁力仪的线宽近似线性增加。实验测试了温度由25℃升高至45℃时的磁力仪输出信号,结果表明:当温度为37.6℃时,原子磁力仪达到最佳灵敏度。
All optical atomic magnetometer with high sensitivity is an important device to detect weak magnetic field. The sensitivity of the atomic magnetometer will be influenced by the operating temperature of Cs vapor cell. As the frequency of circularly polarized pump light and the linearly polarized probe light are locked to Cs D1 transition F= 3→F′ = 4 and Cs D2 transition F= 4→F= 5 respectively, linearly polarized probe light will rotate a small angle due to circular dichroic medium. With the increase of the operating temperature of Cs vapor cell, the output peak signal will increase first and then decrease, but the bandwidth has been increasing. The output signal of magnetometer was measured as the operating temperature varied from 25 ℃ to 45 ℃. The result shows that 37. 6 ℃ is the optimal temperature to achieve the highest sensitivity.
出处
《光学仪器》
2014年第2期152-155,166,共5页
Optical Instruments
基金
科技部国际科技合作项目(2008DFR20420)
东北石油大学青年科学基金资助项目(ky120227)
关键词
原子磁力仪
工作温度
原子气室
圆二向色性
atomic magnetometer
operating temperature
atomic vapor cell
circular dichroism
