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首页> 外文期刊>Applied Optics >Experimental investigation of the performance of an annular aperture and a circular aperture on the same very-small-aperture laser facet
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Experimental investigation of the performance of an annular aperture and a circular aperture on the same very-small-aperture laser facet

机译：在同一个非常小孔径激光刻面上的环形孔径和圆形孔径性能的实验研究

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摘要

A very-small-aperture laser (VSAL) with a circular aperture has a trade-off between the spot size and the output power. A nanometric annular aperture is fabricated to overcome this difficulty. The advantages of the annular aperture are demonstrated by measuring and comparing its near-field intensity distribution with that of a circular aperture. These apertures are fabricated on the same VSAL to ensure that they are under the same illumination conditions. The experimental results indicate that an annular aperture produces a smaller spot size and a higher peak intensity than a circular aperture. The confinement effect and the enhancement effect are attributed to the convergence of the power flow that passes through the annular aperture. The observed enhancement effect decreases when the distance from the VSAL facet is increased, but it does not vanish even when the distance is as large as 3.5 μm.
机译：具有圆形孔径的超小孔径激光器（VSAL）在光斑尺寸和输出功率之间进行权衡。制造纳米环形孔以克服该困难。通过测量并将其近场强度分布与圆形光圈的近场强度分布进行比较，可以证明环形光圈的优势。这些孔是在相同的VSAL上制造的，以确保它们在相同的照明条件下。实验结果表明，与圆形孔径相比，环形孔径产生的光斑尺寸较小，峰强度较高。限制效应和增强效应归因于穿过环形孔的功率流的收敛。到VSAL刻面的距离增加时，观察到的增强效果会降低，但即使距离达到3.5μm，也不会消失。

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