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首页> 外文期刊>Applied optics >Controlling the optical fiber output beam profile by focused ion beam machining of a phase hologram on fiber tip
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Controlling the optical fiber output beam profile by focused ion beam machining of a phase hologram on fiber tip

机译：通过对光纤尖端上的相全息图进行聚焦离子束加工来控制光纤输出光束轮廓

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A phase hologram was machined on an optical fiber tip using a focused ion beam (FIB) system so that a ring-shaped beam emerges from the fiber tip. The fiber used for this work was a commercial single-mode optical fiber patch cable for a design wavelength of 633 nm with a germanosilicate core. The ring-shaped beam was chosen to ensure a simple geometry in the required phase hologram, though the Gerchberg-Saxton algorithm can be used to calculate a hologram for an arbitrary beam shape. The FIB machining took approximately 45 min at 30 kV and 200 pA. The radius of the resulting ring beam was 0.083 m at 1 m standoff, as compared to 0.1 m as was initially desired. Results suggest that this imaging technique may provide a basis for a beam-shaping method with several advantages over the current commercial solutions, having permanent alignment, compactness, and mechanical robustness. However, it would appear that minimizing the speckle pattern will remain a critical challenge for this technique to become widely implemented. (C) 2015 Optical Society of America
机译：使用聚焦离子束（FIB）系统在光纤尖端上加工相全息图，以使环形束从光纤尖端射出。用于这项工作的光纤是商业单模光纤跳线，设计波长为633 nm，带有锗硅酸盐芯。尽管可以使用Gerchberg-Saxton算法来计算任意光束形状的全息图，但选择环形光束以确保所需相位全息图中的几何简单。 FIB机加工在30 kV和200 pA下花费了大约45分钟。间距为1 m时，所得环形光束的半径为0.083 m，而最初所需的半径为0.1 m。结果表明，这种成像技术可以为光束整形方法提供基础，与目前的商业解决方案相比，具有多种优势，具有永久对准，紧凑和机械坚固性。然而，对于该技术被广泛实施而言，似乎最小化斑点图案将仍然是关键的挑战。 （C）2015年美国眼镜学会

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