紧聚焦高阶光束的修正刀口重建
Corrected knife-edge-based reconstruction of tightly focused higher order beams
摘要：
刀口法是一种已建立的技术，用于对均匀紧密聚焦的光束进行轮廓分析。然而，如果没有仔细选择刀刃的材料和几何形状，或者特别是如果使用由纯材料制成的刀刃，则该方法的直接实施失败。在这些情况下，由于研究中的光束与刀的相互作用，在重建的光束轮廓的形状和位置中引入伪影。因此，需要对标准刀口评价方法进行修正。本文研究了高聚焦径向和方位偏振光束及其线偏振分量的刀口法。我们介绍了这些成分的相对位移和报告的一致性与情况下的线性偏振高斯光束。一个适应的刀口重建技术，并证明了概念的测试表明重建的光束轮廓。
英文摘要：
The knife-edge method is an established technique for profiling of even tightly focused light beams. However the straightforward implementation of this method fails if the materials and geometry of the knife-edges are not chosen carefully or in particular if knife-edges are used that are made of pure materials. In these cases artifacts are introduced in the shape and position of the reconstructed beam profile due to the interaction of the light beam under study with the knife. Hence, corrections to the standard knife-edge evaluation method are required. Here we investigate the knife-edge method for highly focused radially and azimuthally polarized beams and their linearly polarized constituents. We introduce relative shifts for those constituents and report on the consistency with the case of a linearly polarized Gaussian beam. An adapted knife-edge reconstruction technique is presented and proof-of-concept tests demonstrating the reconstruction of beam profiles are shown.
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