Efficient and robust photo-ionization loading of beryllium ions
Efficient and robust photo-ionization loading of beryllium ions
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DOI：
10.1007/s00340-018-6903-3
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发表时间：
2017-11
期刊：
影响因子：
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通讯作者：
S. Wolf;D. Studer;K. Wendt;F. Schmidt-Kaler
中科院分区：
文献类型：
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作者：
S. Wolf;D. Studer;K. Wendt;F. Schmidt-Kaler
我们证明了在235 nm附近用60 ns和150 nJ的激光脉冲进行两步光电离可以有效地产生离子，并通过随后计数加载到线性Paul阱中的离子数来证明。选择激光脉冲的带宽和功率，使得第一共振步骤完全饱和从热炉中流出的铍原子的整个速度分布。第二激发步骤由引起有效非共振电离的相同光场驱动。我们的离子加载方案具有类似的效率相比，以前的途径，使用双光子连续波激光激发，但与一个数量级低于平均紫外光功率。
We demonstrate the efficient generation ofions with a 60 ns and 150 nJ laser pulse near 235 nm for two-step photo-ionization, proven by subsequent counting of the number of ions loaded into a linear Paul trap. The bandwidth and power of the laser pulse are chosen in such a way that a first, resonant step fully saturates the entire velocity distribution of beryllium atoms effusing from a thermal oven. The second excitation step is driven by the same light field causing efficient non-resonant ionization. Our ion-loading scheme has a similar efficiency as compared to former pathways using two-photon continuous wave laser excitation, but with an order of magnitude lower than average UV light power.