Fatemi Fredrik K, Terraciano Matthew L, Bashkansky Mark, Dutton Zachary
Optical Sciences Division, Naval Research Laboratory, Washington, DC 20375, USA.
Opt Express. 2009 Jul 20;17(15):12971-80. doi: 10.1364/oe.17.012971.
We have studied velocity-selective resonances in the presence of a uniform magnetic field and shown how they can be used for rapid, single-shot assessment of the ground state magnetic sublevel spectrum in a cold atomic vapor. Cold atoms are released from a magneto-optical trap in the presence of a small bias magnetic field ( approximately 300 mG) and exposed to a laser field comprised of two phase-locked counterpropagating beams connecting the two ground state hyperfine manifolds. An image of the expanded cloud shows the velocity-selected resonances as distinct features, each corresponding to specific magnetic sublevel, in a direct, intuitive manner. We demonstrate the technique with both 87Rb and 85Rb, and show the utility of the technique by optically pumping into particular magnetic sublevels. The results are shown to agree with a theoretical model, and are compared to traditional Raman spectroscopy.
我们研究了在均匀磁场存在下的速度选择性共振，并展示了如何将其用于快速、单次评估冷原子蒸汽中的基态磁子能级光谱。冷原子在小偏置磁场（约300 mG）存在下从磁光阱中释放，并暴露于由连接两个基态超精细能级的两个锁相反向传播光束组成的激光场中。膨胀云团的图像以直接、直观的方式将速度选择共振显示为独特特征，每个特征对应于特定的磁子能级。我们用87Rb和85Rb演示了该技术，并通过光泵浦到特定磁子能级展示了该技术的实用性。结果表明与理论模型相符，并与传统拉曼光谱进行了比较。
