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High-numerical-aperture microlensed tip on an air-clad optical fiber

机译:气包光纤上的高数值孔径微透镜头

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摘要

We show that a hemispherically shaped tip on an air-clad optical fiber simultaneously works as a high-numerical-aperture lens and efficiently collects photons from an emitter placed near the beam waist into the fundamental guided mode. Numerical simulations show that the coupling efficiency reaches about 25%. We have constructed a confocal microscope with such a lensed fiber. The measurements are in good agreement with the numerical simulation. The monolithic structure with a high-photon-collection efficiency will provide a flexible substitute for a conventional lens system in various experiments such as single-atom trapping with a tightly focused optical trap.
机译:我们显示出,空气包覆光纤上的半球形尖端同时充当高数值孔径透镜,并有效地从位于束腰附近的发射器中收集光子,成为基本的引导模式。数值模拟表明,耦合效率达到约25%。我们用这种透镜光纤构造了一个共聚焦显微镜。测量结果与数值模拟非常吻合。具有高光子收集效率的单片结构将在各种实验(例如使用紧密聚焦的光阱的单原子阱)中提供常规透镜系统的灵活替代品。

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