论文标题
使用单个多通单元格
Femtotesla direct magnetic gradiometer using a single multipass cell
论文作者
论文摘要
我们在两个$^{87} $ rb原子集合中使用相反的圆极化的光学泵仪描述了一个直接梯度计。遥不可及的探针激光器经历了接近零的顺磁性法拉第旋转，这是由于两种贡献的固有减法超过高度极化的集合的3.5 rad。我们为直接梯度计信号开发分析方法，并测量梯度仪的灵敏度$ 10.1 $ ft/cm $ \ sqrt {\ mathrm {hz}} $。我们还证明，除了增加光学深度外，我们的多通设计还具有基本优势，这是由于原子扩散对自旋噪声时间相关的影响显着降低，并且与理论估计值非常吻合。
We describe a direct gradiometer using optical pumping with opposite circular polarization in two $^{87}$Rb atomic ensembles within a single multipass cell. A far-detuned probe laser undergoes a near-zero paramagnetic Faraday rotation due to the intrinsic subtraction of two contributions exceeding 3.5 rad from the highly-polarized ensembles. We develop analysis methods for the direct gradiometer signal and measure a gradiometer sensitivity of $10.1$ fT/cm$\sqrt{\mathrm{Hz}}$. We also demonstrate that our multipass design, in addition to increasing the optical depth, provides a fundamental advantage due to the significantly reduced effect of atomic diffusion on the spin noise time-correlation, in excellent agreement with theoretical estimate.
