Simulation of Diffraction on a Stepped Spiral Phase Plate with Radiation of Different Wavelengths in order to Form Optical Vortices of Different Orders

IF 1 Q4 OPTICS

Optical Memory and Neural Networks Pub Date : 2024-12-11 DOI:10.3103/S1060992X24700310

P. A. Khorin, S. K. Sergunin, S. N. Khonina, V. P. Veiko, G. K. Kostyuk, V. A. Shkuratova

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Abstract

The diffraction of a Gaussian beam by a stepped spiral phase plate (SPP) is studied for different wavelengths of laser radiation. Numerically, using the finite difference time domain method, the formation of a vortex beam by a SPP with different number of uniform sectors is shown. The diffraction of laser radiation with a wavelength in the range from 0.5 to 1.5 μm by a SPP with 20 sectors was calculated and the transformation of a Gaussian beam into a vortex beam with different topological charges due to variations in wavelength was shown. To determine the value of the orbital angular momentum (OAM) of the formed vortex beam, the weight spectrum is calculated on the basis of angular harmonics (AH). We estimated the vortex beam quality of an integer order using a multichannel diffractive optical element (DOE), which implements the optical decomposition of the light field according to the AH basis. The detection of vortex beams with 1st, 2nd and 3rd order is shown numerically by matched filtering.

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不同波长辐射下阶梯螺旋相板的衍射模拟，以形成不同阶次的光旋涡

研究了不同波长激光对阶梯螺旋相板高斯光束的衍射。数值上，利用时域有限差分法，给出了具有不同均匀扇形数的SPP形成涡旋光束的过程。计算了波长在0.5 ~ 1.5 μm范围内的激光辐射在20扇区SPP下的衍射，得到了高斯光束随波长变化向具有不同拓扑电荷的涡旋光束的转变。为了确定形成的涡旋光束的轨道角动量（OAM）值，在角谐波（AH）的基础上计算了权谱。利用多通道衍射光学元件（DOE）估计了整数阶的涡旋光束质量，该元件根据AH基实现了光场的光学分解。通过匹配滤波对一、二、三阶涡旋光束的检测进行了数值模拟。

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来源期刊

Optical Memory and Neural Networks OPTICS-

CiteScore

1.50

自引率

11.10%

发文量

期刊介绍： The journal covers a wide range of issues in information optics such as optical memory, mechanisms for optical data recording and processing, photosensitive materials, optical, optoelectronic and holographic nanostructures, and many other related topics. Papers on memory systems using holographic and biological structures and concepts of brain operation are also included. The journal pays particular attention to research in the field of neural net systems that may lead to a new generation of computional technologies by endowing them with intelligence.