Spin-exchange relaxation free alkali-metal magnetometers typically operate inthe regime of high optical density, presenting challenges for simple andefficient optical pumping and detection. We describe a high-sensitivity Rbmagnetometer using a single elliptically-polarized off-resonant laser beam.Circular component of the light creates relatively uniform spin polarizationwhile the linear component is used to measure optical rotation generated by theatoms. Modulation of the atomic spin direction with an oscillating magneticfield shifts the detected signal to high frequencies. Using a fiber-coupled DFBlaser we achieve magnetic field sensitivity of 7 fT/$\sqrt{% \mathrm{Hz}}$ witha miniature $5\times5\times5$ mm Rb vapor cell.
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机译：自旋交换无弛豫碱金属磁力计通常在高光密度范围内运行，这对简单有效的光泵浦和检测提出了挑战。我们描述了一种使用单椭圆偏振非共振激光束的高灵敏度Rb磁力计，光的圆形分量产生相对均匀的自旋极化，而线性分量用于测量由原子产生的旋光。用振荡磁场调制原子自旋方向会将检测到的信号移至高频。使用光纤耦合的DFBlaser，我们使用微型$ 5 \ times5 \ times5 $ mm Rb蒸汽电池实现了7 fT / $ \ sqrt {％\ mathrm {Hz}} $的磁场灵敏度。
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