Extraction of main elements from a TEM composite laser pattern

We examined the atypical formation and superposition of transverse electromagnetic modes (TEM) of high order in a commercial He-Ne laser (@543.5 nm). The competence of the dominant modes exhibits a periodic and stable dynamic, uncommon in industrialized systems. Also, the intensity shows a smooth tr...

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Bibliographic Details
Published in:Journal of physics. Conference series 2021-01, Vol.1723 (1), p.12023
Main Authors: Zúñiga, V Torres, Velázquez Aguilar, V M, Bañuelos Muñeton, J G
Format: Article
Language:English
Subjects:
Algorithms
Astigmatism
Hermite polynomials
Image processing
Lasers
Physics
Transverse electromagnetic modes
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Summary:We examined the atypical formation and superposition of transverse electromagnetic modes (TEM) of high order in a commercial He-Ne laser (@543.5 nm). The competence of the dominant modes exhibits a periodic and stable dynamic, uncommon in industrialized systems. Also, the intensity shows a smooth transition. The origin of the phenomenon is only a product of intra-cavity diffractive components. We found the promotors are a stable optical cavity but quasi-degenerated, with large transversal section (the Fresnel number is irregular), and a breaking the axial symmetry (producing astigmatism). The analysis of the average intensity patterns, and a correlation algorithm — via bi-orthogonal decomposition based on Hermite-Gauss polynomials — expose the five principal TEM elements. These results could be meaningful and inspiring both in courses of optics, laser engineering as in image processing.
ISSN:1742-6588
1742-6596
DOI:10.1088/1742-6596/1723/1/012023