Efficient saturation of an ion in free space
Efficient saturation of an ion in free space
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DOI：
10.1007/s00340-014-5817-y
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发表时间：
2014-12-01
影响因子：
2.1
通讯作者：
Leuchs, Gerd
中科院分区：
文献类型：
--
作者：
Fischer, Martin;Bader, Marianne;Leuchs, Gerd
本文报道了在自由空间中将光耦合到单个Yb-174（+）离子的光物质界面的演示。界面是通过部分包围离子的抛物面镜实现的。它将一束拉盖尔-高斯光束转换成一束线性偶极波，会聚在反射镜的焦点上。通过测量原子跃迁的非线性响应，我们推导出在半线宽失谐时，达到1/4上能级布居所需的功率为692 +/-20pW。在通过焦点扫描离子的同时执行该测量提供了焦点强度分布的图。从测得的功率，我们推断的耦合效率为7.2 +/- 0.2%的线性偶极跃迁照射时，从半立体角，是最好的耦合效率报告的一个原子在自由空间。
We report on the demonstration of a lightmatter interface coupling light to a single Yb-174(+) ion in free space. The interface is realized through a parabolic mirror partially surrounding the ion. It transforms a La-guerre- Gaussian beam into a linear dipole wave converging at the mirror's focus. By measuring the non-linear response of the atomic transition, we deduce the power required for reaching an upper-level population of 1/4 to be 692 +/- 20pW at half linewidth detuning from the atomic resonance. Performing this measurement while scanning the ion through the focus provides a map of the focal intensity distribution. From the measured power, we infer a coupling efficiency of 7.2 +/- 0.2% on the linear dipole transition when illuminating from half solid angle, being among the best coupling efficiencies reported for a single atom in free space.