基于惠更斯-菲涅耳原理, 研究了像散对轴棱锥产生径向偏振无衍射光束的影响。研究结果表明, 当轴棱锥像散值达到0.1 λ 时, 轴棱锥聚焦径向偏振光束得到的径向偏振无衍射光束, 其径向偏振特性将失去。而随着像散值的增大, 径向偏振无衍射光束的无衍射区域逐渐缩短, 当像散值达到0.2 λ 时, 无衍射特性将消失。径向偏振特性与无衍射特性的消失并不同步, 这一结果表明利用轴棱锥产生径向偏振无衍射光束时, 光束的偏振特性受像散的影响比无衍射特性大。实验中采用轴棱锥中心轴偏离光轴的方法, 验证了像散对产生径向偏振无衍射光束的影响, 实验结果与理论分析基本吻合。研究结果将使径向偏振无衍射光束的实现更加灵活准确。

Based on the Huygens-Fresnel principle, the influence of astigmatism on the generation of radial polarized non-diffracting beams by the axicon is investigated. Research results show that when the value of the axicon astigmatism is 0.1 λ , the radial polarized distribution of radial polarized non-diffracting beams generated by axicon focusing radial polarized beams vanishes. Non-diffracting property of the radial polarized non-diffracting beams loses gradually, when the value of astigmatism increases. Particularly when the value of the astigmatism is 0.2 λ , the non-diffracting property vanishes. The vanishing of the radial polarized distribution and the non-diffracting property are not synchronized. This result demonstrates that in the generation of radial polarized non-diffracting beams by the axicon, the polarization property of beams is affected more by the astigmatism than the non-diffracting property.By using of the divergence between the optical axial and the central axial of the axicon in the experiments, the influence of astigmatism on the generation of radial polarized non-diffracting beams is verified. The experimental results are basically consistent with theoretical analysis. The research results will enable the generation of the radial polarized non-diffracting beams more flexible and accurate.