铷原子磁力仪最佳抽运光强的研究

为了得到铷原子磁力仪的最佳抽运光强，进而优化原子磁力仪的灵敏度，理论分析了抽运光强与磁力仪的极化率、信噪比以及灵敏度之间的关系，设计了实验装置。采用自由感应衰减法对直径20mm的铷原子球形气室在不同抽运光强下对应的横向弛豫时间进行测量，并对相应的纵向弛豫时间进行测量，计算出了不同光强下的极化率，通过拟合得到了光强与极化率、信噪比以及灵敏度之间的关系曲线。结果表明，可在10mW/cm2附近得到系统最佳抽运光强。此研究结果为提高光强利用率并进一步优化铷原子磁力仪的灵敏度提供了指导。

Research of optimal pump light intensity in rubidium atomic magnetometers

In order to obtain the optimal pump light intensity of a rubidium atomic magnetometer and improve its sensitivity , the relationships among the polarization , signal to noise ratio , sensitivity of magnetometer and pump light intensity were analyzed . An experimental system was designed .Transverse relaxation time and longitudinal relaxation time of a 20mm diameter spherical vapor cell with different pump light intensity were measured by using free induction decay method .The corresponding polarization data was calculated and the fitting curves of polarization , signal to noise ratio , sensitivity influenced by pump light intensity were received.The results show that the optimal pump light intensity is optimum in the rubidium atomic magnetometer under the pump light intensity of about 10mW/cm2 .It will be helpful for using the pump light effectively and optimizing sensitivity of the rubidium atomic magnetometers further .