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Destroying and recovering spiral vortex beams due to figured perturbations
Journal of the Optical Society of America A ( IF 1.9 ) Pub Date : 2021-11-15 , DOI: 10.1364/josaa.440756 A. Volyar , E. Abramochkin , Ya. Akimova , M. Bretsko
Journal of the Optical Society of America A ( IF 1.9 ) Pub Date : 2021-11-15 , DOI: 10.1364/josaa.440756 A. Volyar , E. Abramochkin , Ya. Akimova , M. Bretsko
Using asymptotic approaches and an experiment supported by computer simulation, we examined transforming spiral vortex (SV) beams caused by affecting figured hard-edged apertures. By the example of a tetragonal beam, we considered three perturbation scenarios: (1) asymmetric perturbation, when an opaque screen covers the caustic only on one side of the tetragon, (2) symmetric perturbation, when the figured aperture covers the entire beam except for a narrow caustic region, and (3) symmetric perturbation when the figured aperture screens only the caustic region without affecting the rest of the beam. At the same time, we carried out asymptotic calculations for all types of polygonal beams. It was found that the beam can partially restore its original state if the aperture does not touch the caustic region. Otherwise, the former SV beam structure is destroyed, but a new stable state appears in a far diffraction zone.
中文翻译:
由于图形扰动破坏和恢复螺旋涡旋光束
使用渐近方法和计算机模拟支持的实验,我们检查了由影响图形硬边孔径引起的转换螺旋涡 (SV) 光束。以四边形光束为例,我们考虑了三种扰动场景:(1) 不对称扰动,当不透明屏幕仅覆盖四边形一侧的焦散时,(2) 对称扰动,当图形孔径覆盖整个光束时,除了对于狭窄的焦散区域,以及 (3) 当图形孔径仅屏蔽焦散区域而不影响光束的其余部分时的对称扰动。同时,我们对所有类型的多边形梁进行了渐近计算。发现如果孔径不接触焦散区域,光束可以部分恢复其原始状态。除此以外,
更新日期:2021-12-02
中文翻译:
由于图形扰动破坏和恢复螺旋涡旋光束
使用渐近方法和计算机模拟支持的实验,我们检查了由影响图形硬边孔径引起的转换螺旋涡 (SV) 光束。以四边形光束为例,我们考虑了三种扰动场景:(1) 不对称扰动,当不透明屏幕仅覆盖四边形一侧的焦散时,(2) 对称扰动,当图形孔径覆盖整个光束时,除了对于狭窄的焦散区域,以及 (3) 当图形孔径仅屏蔽焦散区域而不影响光束的其余部分时的对称扰动。同时,我们对所有类型的多边形梁进行了渐近计算。发现如果孔径不接触焦散区域,光束可以部分恢复其原始状态。除此以外,