Fraunhofer diffraction of a Gaussian beam by a four-sector binary grating with a half period fringes shift between adjacent sectors 机翻标题: 暂无翻译,请尝试点击翻译按钮。

来源
Optical and Quantum Electronics
年/卷/期
2019 / 51 / 3
ISSN号
0306-8919
作者单位
Univ Ss Cyril & Methodius, Inst Phys, Fac Nat Sci & Math, Skopje 1000, Macedonia;Univ Ss Cyril & Methodius, Inst Phys, Fac Nat Sci & Math, Skopje 1000, Macedonia;Sofia Univ St Kliment Ohridski, Fac Phys, Dept Quantum Elect, Sofia 1164, Bulgaria;Sofia Univ St Kliment Ohridski, Fac Phys, Dept Quantum Elect, Sofia 1164, Bulgaria;
作者
Janicijevic, Lj.;Topuzoski, S.;Stoyanov, L.;Dreischuh, A.;
摘要
The study of Fraunhofer diffraction of a Gaussian laser beam by a computer-generated, binary four-sector grating (FSG) is presented. In the four equal angular sectors of the FSG, parts of a binary rectilinear grating are embedded in such a way that, two neighboring parts are shifted by a half spatial rectilinear grating period. Analytical expressions, describing the diffracted wave field amplitude and intensity distributions in the focal plane of a converging lens, are derived. The zeroth-diffraction-order beam is a Gaussian beam whose transverse cross section has a reduced Gaussian radius. The higher-diffraction-order beam transverse intensity profiles have four bright spots divided by dark crossed lines and a central dark, non-vortex core. They can be described as cosine-Laguerre-Gaussian Kummer beams. The numerically calculated diffraction patterns, as well as the interference patterns of the diffracted beam with a slightly inclined plane wave, are supported by experimentally obtained ones. In both investigations (theoretical and experimental) the interferograms confirm the non-vortex nature of the diffraction spots.
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关键词/主题词
Fraunhofer diffraction;Gaussian laser beam;Four-sector grating;
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