用于地磁场应用的总场原子磁力计：基于椭圆偏振频率调制光束
Total-field atomic magnetometry using an elliptically-polarized frequency-modulated light beam for geomagnetic-field applications
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中文总结 AI 辅助
本研究提出一种基于椭圆偏振频率调制光束的Bell-Bloom全光学方案，实现地磁场尺度高灵敏度总场测量，在50微特斯拉下灵敏度达220 fT/√Hz，且结构简单、易于小型化。
中文摘要 AI 辅助
我们研究了一种用于地球尺度磁场（$B$）高灵敏度测量的全光学方案。该方案基于频率调制光的Bell-Bloom技术。使用单一椭圆偏振光束，既用于泵浦碱金属原子，也用于探测其自旋在外磁场下的拉莫尔进动。与许多其他基于光非线性偏振旋转的高灵敏度磁力计方案不同，所提出的方法能够通过光束椭圆率参数的变化来观测磁共振。该方法已在垂直腔面发射激光器照射含有缓冲气体的$0.125$ cm$^3$铯蒸气室的实验中验证。在当前实验条件下，在$B$$\\,\approx\\,$50 $\mu$T时，实现的灵敏度估计为$220$ fT/$\surd$Hz，而散粒噪声底对应约$20$ fT/$\surd$Hz。带宽估计约为$1$ kHz。所提出的简单而稳健的单光束方案非常适合小型化，因此特别有望用于开发紧凑、高灵敏度、低功耗的原子磁力计，以广泛应用于地磁场领域。
英文摘要
We investigate an all-optical scheme for high-sensitivity measurements of the Earth's scale magnetic field ($B$). The scheme is based on the Bell-Bloom technique with frequency-modulated light. A single elliptically polarized light beam is used both for pumping the alkali-metal atoms and probing Larmor precession of their spins under the external magnetic field. In contrast to many other high-sensitivity magnetometry schemes based on nonlinear polarization rotation of the light, the proposed approach enables the observation of magnetic resonance via changes in the light-beam ellipticity parameter. The approach has been validated in experiments with a vertical-cavity surface-emitting laser, irradiating a $0.125$ cm$^3$ cesium vapor cell filled with a buffer gas. In the current experimental conditions, the achieved sensitivity is estimated at $220$ fT/$\surd$Hz under $B$$\,\approx\,$$50$ $μ$T, while the shot-noise floor corresponds to $\approx\,$$20$ fT/$\surd$Hz. The bandwidth is estimated at $\approx\,$$1$ kHz. The proposed simple and robust single-beam scheme is well suited for miniaturization and is therefore particularly promising for the development of compact, highly sensitive, low-power-consumption atomic magnetometers for a wide range of applications in the geomagnetic field.
发表机构
- Institute of Laser Physics SB RAS（俄罗斯科学院西伯利亚分院激光物理研究所）
- Ioffe Institute RAS（俄罗斯科学院约费研究所）
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