Speckle patterns produced by an optical vortex and its application to surface roughness measurements

Passos M. H. M.; Lemos M. R.; Almeida S. R.; Balthazar W. F.; da Silva L.; Huguenin J. A. O.

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Speckle patterns produced by an optical vortex and its application to surface roughness measurements

机译：光学涡流产生的散斑图案及其在表面粗糙度测量中的应用

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In this work, we report on the analysis of speckle patterns produced by illuminating different rough surfaces with an optical vortex, a first-order ( l 1) Laguerre-Gaussian beam. The generated speckle patterns were observed in the normal direction exploring four different planes: the diffraction plane, image plane, focal plane, and exact Fourier transform plane. The digital speckle patterns were analyzed using the Hurst exponent of digital images, an interesting tool used to study surface roughness. We show a proof of principle that the Hurst exponent of a digital speckle pattern is more sensitive with respect to the surface roughness when the speckle pattern is produced by an optical vortex and observed at a focal plane. We also show that Hurst exponents are not so sensitive with respect to the topological charge l. These results open news possibilities of investigation into speckle metrology once we have several techniques that use speckle patterns for different applications. (C) 2017 Optical Society of America

机译：在这项工作中，我们报告了通过用光学涡流照射不同粗糙表面而产生的散斑图案的分析，一阶（L 1）Laguerre-Gaussian梁。在正常方向上观察到产生的散斑图案探索四个不同的平面：衍射平面，图像平面，焦平面和精确的傅里叶变换平面。使用数字图像的狭步指数分析数字斑点模式，用于研究表面粗糙度的有趣工具。我们展示了原则上的证据，即当通过光学涡流产生散斑图案并在焦平面观察时，数字斑点图案的狭长指数对表面粗糙度更敏感。我们还表明，对于拓扑电荷L，赫斯特指数对LOP不太敏感。一旦我们有几种技术为不同应用程序使用散斑模式的技术，这些结果将开放调查的新闻调查的可能性。（c）2017年光学学会

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《Applied optics》 |2017年第2期|共6页
作者
Passos M. H. M.; Lemos M. R.; Almeida S. R.; Balthazar W. F.; da Silva L.; Huguenin J. A. O.;
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Univ Fed Fluminense Inst Ciencias Exatas BR-27213145 Volta Redonda RJ Brazil;

Univ Fed Fluminense Inst Ciencias Exatas BR-27213145 Volta Redonda RJ Brazil;

Univ Fed Fluminense Inst Ciencias Exatas BR-27213145 Volta Redonda RJ Brazil;

Inst Fed Educ Ciencia &

Tecnol Rio de Janeiro BR-27213100 Volta Redonda RJ Brazil;

Univ Fed Fluminense Inst Ciencias Exatas BR-27213145 Volta Redonda RJ Brazil;

Univ Fed Fluminense Inst Ciencias Exatas BR-27213145 Volta Redonda RJ Brazil;

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Speckle patterns produced by an optical vortex and its application to surface roughness measurements

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