In this paper, we experimentally study the saturation effect of rubidium atomic magnetic resonance. A pump beam is applied to create atomic spin polarization, a radio frequency (RF) magnetic field is used to drive the spin precession about a static magnetic field, and an off-resonant linearly polarized probe beam is applied to detect the spin dynamics based on the Faraday-rotation effect. When the RF magnetic field intensity becomes strong, a saturation effect is observed. We measure the resonant peak under strong RF magnetic field driving and obtain a saturation dip as an indication of the saturation effect. Furthermore, we show that the line-width of the saturation dip is much smaller than that of magnetic resonance. Accordingly, the sensitivity of the precision measurement based on the saturation dip can be significantly improved. The relations between the saturation dip in the resonant peak and the driving RF magnetic field intensity, as well as pumping intensity, are also studied in our experiment.

中文翻译：

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原子核磁共振的饱和效应

在本文中，我们通过实验研究了atomic原子磁共振的饱和效应。施加泵浦光束以产生原子自旋极化，使用射频（RF）磁场驱动自旋进动围绕静磁场，并使用非共振线性极化探测光束检测基于自旋的法拉第旋转效应。当RF磁场强度变强时，观察到饱和效应。我们在强大的RF磁场驱动下测量共振峰，并获得饱和下陷作为饱和效应的指标。此外，我们显示出饱和倾角的线宽比磁共振的线宽小得多。因此，可以显着提高基于饱和度下降的精度测量的灵敏度。