Generation of perfect optical vortices using a Bessel-Gaussian beam diffracted by curved fork grating

Karahroudi Mahdi Khodadadi; Parmoon Bahman; Qasemi Mohammadreza; Mobashery Abolhasan; Saghafifar Hossein

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Generation of perfect optical vortices using a Bessel-Gaussian beam diffracted by curved fork grating

机译：使用弯曲的叉光栅衍射的贝塞尔高斯光束产生完美的光学涡旋

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Perfect optical vortices (POVs) are beams whose topological charges are independent of radius, unlike conventional optical vortices. POVs are the Fourier transformation of Bessel-Gaussian (BG) beams and can be seen in the far-field diffraction of BG beams. In this paper, we present the generation of POVs of arbitrary charge using curved fork grating (CFG) illuminated by BG beam. For this purpose, first, a theoretical study of the Fresnel-Kirchhoff integral for diffraction of a BG beam by CFG is completed. The analytical results show the presence of vortex beams with various topological charges in diffraction orders. Then, diffraction of the BG beam with the order (l) by CFG with a topological charge (p) is numerically simulated. Additionally, experimental results prove the generation of POVs in diffraction orders. Also, experimental interference patterns obtained by interfering a POV and Gaussian beam confirm the ability of analytical solutions to determine the topological charges of vortex beams. Comparison of the results reveals the validity of the analytical, simulation, and experimental results. (C) 2017 Optical Society of America

机译：与传统的光学涡流不同，完美的光学涡旋（POV）是其拓扑电荷与半径无关的横梁。 POV是贝塞尔-Gaussian（BG）光束的傅里叶变换，并且可以在BG梁的远场衍射中看到。在本文中，我们使用由BG梁照射的弯曲叉光栅（CFG）呈现任意电荷的POV。为此目的，首先，完成了CFG对BG束衍射的Fresnel-kirchhoff的理论研究。分析结果显示涡流束的存在，在衍射令中具有各种拓扑电荷。然后，在数值模拟中模拟具有拓扑电荷（P）的CFG（L）的BG光束的衍射（L）。另外，实验结果证明了衍射令的衍射令的产生。而且，通过干扰POV和高斯光束而获得的实验干扰模式确认了分析解决方案以确定涡流束的拓扑电荷的能力。结果的比较揭示了分析，模拟和实验结果的有效性。（c）2017年光学学会

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《Applied optics》 |2017年第21期|共7页
作者
Karahroudi Mahdi Khodadadi; Parmoon Bahman; Qasemi Mohammadreza; Mobashery Abolhasan; Saghafifar Hossein;
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作者单位

Malek Ashtar Univ Technol Opt &

Laser Sci &

Technol Res Ctr Shahin Shahr Isfahan Iran;

Malek Ashtar Univ Technol Opt &

Laser Sci &

Technol Res Ctr Shahin Shahr Isfahan Iran;

Malek Ashtar Univ Technol Opt &

Laser Sci &

Technol Res Ctr Shahin Shahr Isfahan Iran;

Malek Ashtar Univ Technol Opt &

Laser Sci &

Technol Res Ctr Shahin Shahr Isfahan Iran;

Malek Ashtar Univ Technol Opt &

Laser Sci &

Technol Res Ctr Shahin Shahr Isfahan Iran;

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Generation of perfect optical vortices using a Bessel-Gaussian beam diffracted by curved fork grating

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