Wang Yaxiang, Jin Ge, Tang Junjian, Zhou Weiyong, Han Bangcheng, Zhou BinQuan, Shi Tao
Opt Express. 2022 Jan 3;30(1):336-348. doi: 10.1364/OE.447456.
We present a theoretical and experimental study of a single-beam spin-exchange relaxation-free magnetometer in Rb vapor cells under different nitrogen gas pressures. The spin relaxation rate is a key component to limit the magnetic sensitivity, and the zero-field resonance method was used to measure the spin relaxation rates of different alkali metal cells. Simultaneously, in a single-beam spin-exchange-relaxation-free (SERF) magnetometer, we demonstrated that the fundamental magnetic field sensitivity was also limited by the pumping light intensity. Based on our theoretical analysis and experimental results, we determined the optimal pumping light intensity and optimal gas pressure. We experimentally demonstrated that the magnetic field sensitivity was 8.89 fT/Hz in the single-beam configuration, with an active measurement volume of 3 × 3 × 3~mm.
我们展示了在不同氮气压力下，对铷蒸汽池中单光束自旋交换无弛豫磁力计的理论和实验研究。自旋弛豫率是限制磁灵敏度的关键因素，采用零场共振法测量了不同碱金属池的自旋弛豫率。同时，在单光束自旋交换无弛豫（SERF）磁力计中，我们证明了基本磁场灵敏度也受泵浦光强度的限制。基于我们的理论分析和实验结果，我们确定了最佳泵浦光强度和最佳气体压力。我们通过实验证明，在单光束配置下，磁场灵敏度为8.89 fT/Hz，有效测量体积为3×3×3~mm。
