当前位置: X-MOL 学术Opt. Lett. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Diffractometry-based vortex beams fractional topological charge measurement.
Optics Letters ( IF 3.6 ) Pub Date : 2020-06-22 , DOI: 10.1364/ol.395440
S M A Hosseini-Saber , Ehsan A Akhlaghi , Ahad Saber

In this Letter, we investigate the Fresnel diffraction of vortex beams from a phase plate and propose a novel (to the best of our knowledge) method to determine the fractional part of the topological charge of vortex beams. When a vortex beam with a fractional topological charge illuminates the edge region of a transparent plate, the visibility of the diffraction pattern on two sides of the beam is different. Rotation of the phase plate changes the visibility on the left and right sides of the beam, periodically. By measuring three consecutive angles of the minimum visibilities, the fractional part of the topological charge is obtained. The proposed method is verified experimentally and is shown to be independent of the phase plate and vortex beam parameters. The precision of the method is obtained better than 0.01.

中文翻译:

基于衍射的涡旋光束分数拓扑电荷测量。

在这封信中,我们研究了来自相位板的涡旋光束的菲涅耳衍射,并提出了一种新颖的方法(据我们所知),以确定涡旋光束的拓扑电荷的分数部分。当具有分数拓扑电荷的涡旋光束照亮透明板的边缘区域时,光束两侧的衍射图可见性不同。相板的旋转会定期更改光束左侧和右侧的可见性。通过测量最小可见性的三个连续角度,可获得拓扑电荷的分数部分。实验证明了该方法的有效性,并且表明该方法与相位板和涡旋光束参数无关。该方法的精度优于0.01。
更新日期:2020-07-02
down
wechat
bug