Sánchez-López María M, Davis Jeffrey A, Moreno Ignacio, Cofré Aarón, Cottrell Don M
Opt Express. 2019 Feb 4;27(3):2374-2386. doi: 10.1364/OE.27.002374.
The robustness of the polarization spatial distribution of vector beams upon propagation is crucial for a number of applications, including optical communications and materials processing. This study has been commonly centered on Gouy phase effects on focused vector beams. In this work, we present a theoretical and experimental analysis of the Gouy phase's effects on the propagation of pure and hybrid vector beams. Experimental results at various axial planes, before and past the focus, are obtained by using a simplified liquid-crystal spatial light modulator-based optical system that allows the easy generation of these beams. Furthermore, a new alternative optical set-up that is devoid of moving elements is demonstrated, which simplifies this study. We experimentally verify the differences between pure and hybrid vector beams upon propagation. While the first ones remain stable, hybrid vector beams show Gouy phase effects that demonstrate an optical activity where the local polarization states rotate by an angle that depends on the propagation distance. Experimental results agree with the theory.
矢量光束偏振空间分布在传播过程中的稳健性对于包括光通信和材料加工在内的许多应用至关重要。这项研究通常集中在古依相位对聚焦矢量光束的影响上。在这项工作中，我们对古依相位对纯矢量光束和混合矢量光束传播的影响进行了理论和实验分析。通过使用基于简化液晶空间光调制器的光学系统，在焦点前后的各个轴向平面上获得了实验结果，该系统能够轻松产生这些光束。此外，还展示了一种没有移动元件的新型替代光学装置，这简化了这项研究。我们通过实验验证了纯矢量光束和混合矢量光束在传播过程中的差异。虽然纯矢量光束保持稳定，但混合矢量光束显示出古依相位效应，表现出一种光学活性，即局部偏振态旋转一个取决于传播距离的角度。实验结果与理论相符。
