Optical sideband spectroscopy of a single ion in a Penning trap
Optical sideband spectroscopy of a single ion in a Penning trap
复制标题
DOI：
10.1103/physreva.89.032502
复制
发表时间：
2014-03-06
影响因子：
2.9
通讯作者：
Segal, D. M.
中科院分区：
文献类型：
--
作者：
Mavadia, S.;Stutter, G.;Segal, D. M.
我们在Penning阱中对单个Ca-40（+）离子进行了分辨光学边带光谱分析。我们在729 nm处探测了允许S-1/2 D-5/2跃迁的电四极子，并观察到三种运动模式的等距边带。与阱轴平行的轴向模式是一维谐振子，而径向回旋加速器和磁控管模式是垂直于磁场的圆周运动。与磁控管运动有关的总能量是负的，但这里我们只探测（正）动能。根据三种运动对应的边带光谱等效多普勒宽度，我们发现轴向、修正回旋加速器和磁控管模式的有效温度分别为1.1 +/- 0.2 mK、7 +/- 3 mK和42 +/- 8 mu K。这些应该与使用最佳激光参数估计的冷却极限（0.38 mK， 0.8 mK和类似于10 μ k）进行比较。在未来的工作中，我们的目标是在729 nm跃迁上对离子进行解析边带冷却。
We perform resolved optical sideband spectroscopy on a single Ca-40(+) ion in a Penning trap. We probe the electric quadrupole allowed S-1/2 D-5/2 transition at 729 nm and observe equally spaced sidebands for the three motional modes. The axial mode, parallel to the trap axis, is a one-dimensional harmonic oscillator, whereas the radial cyclotron and magnetron modes are circular motions perpendicular to the magnetic field. The total energy associated with the magnetron motion is negative, but here we probe only the (positive) kinetic energy. From the equivalent Doppler widths of the sideband spectra corresponding to the three motions we find effective temperatures of 1.1 +/- 0.2 mK, 7 +/- 3 mK, and 42 +/- 8 mu K for the axial, modified cyclotron, and magnetron modes, respectively. These should be compared to the cooling limits, estimated using optimal laser parameters, of 0.38 mK, 0.8 mK, and similar to 10 mu K. In future work we aim to perform resolved-sideband cooling of the ion on the 729-nm transition.