A novel atomic lens scheme is reported. A cylindrical lens potential was created by a large period ( 45 μm) standing light wave perpendicular to a beam of metastable He atoms. The lens aperture (25 μm) was centered in one antinode of the standing wave; the laser frequency was nearly resonant with the atomic transition 2 3 S 1 – 2 3 P 2 (lambda=1.083 μm) and the interaction time was significantly shorter than the spontaneous lifetime (100 ns) of the excited state. The thickness of the lens was given by the laser beam waist (40μm) in the direction of the atomic beam. Preliminary results are presented, where an atomic beam is focused down to a spot size of 4μm. Also, a microfabricated grating with a period of 8m was imaged. We discuss the principle limitations of the spatial resolution of the lens given by spherical and chromatic aberrations as well as by diffraction. The fact that this lens is very thin offers new perspectives for deep focusing into the nm range.
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机译：报道了一种新颖的原子透镜方案。垂直于亚稳态He原子束的大周期（45μm）驻波产生柱面透镜电位。透镜孔径（25μm）位于驻波的一个波腹中心；激光频率几乎与原子跃迁2 3 S 1-2 3 P 2（λ= 1.083μm）共振，并且相互作用时间明显短于激发态的自发寿命（100 ns）。透镜的厚度由原子束方向上的激光束腰（40μm）给出。给出了初步结果，其中原子束聚焦到4μm的光斑尺寸。另外，成像了周期为8m的微型光栅。我们讨论了由球差和色差以及衍射给定的透镜空间分辨率的原理限制。该透镜非常薄的事实为深入聚焦到nm范围提供了新的视角。
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