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Correlation between coherent and scattered optical vortices: diagnosis of the topological charge

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Abstract

Many researchers have been interested in finding elements that help in calculating the orbital angular momentum (OAM) of perturbed vortex beams i.e., after propagating through turbulence in recent years. In this work, we realized a method that utilizes the area of spatial auto-correlation function of scattered optical vortices for finding the topological charge. We have also established an analogy between the area of the intensity auto-correlation profile of the partially coherent vortices and the radii of the related coherent ring-shaped vortex beam transverse profiles which helps us finding the topological charge in a simpler way. This method is independent of the beam waist of Gaussian laser beam for generating the vortex beams. Our experimental results are in good agreement with the theoretically obtained results. These results may find applications in free space optical communication and ghost imaging with vortex beams.

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All data generated or analysed during this study are included in this published article.

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Funding

This work was supported by SRM University AP, SRMAP/URG/E&PP/2022-23/003, SRMAP/URG/E & amp; PP/2022-23/003, Science and Engineering Research Board, SRG/2019/000857

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Author notes

  1. M. Vinny Cris and Vanitha Patnala have contributed equally to this work.

Authors and Affiliations

  1. SRM University-AP, Neerukonda, Mangalagiri, Guntur, Andhra Pradesh, 522502, India

    M. Vinny Cris, Vanitha Patnala & Salla Gangi Reddy

  2. Centro Territorial de Educação Profissional de Vitória da Conquista, CETEP-VC, 45.031-300, Vitória da Conquista, Brazil

    Cleberson R. Alves

Authors
  1. M. Vinny Cris
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  2. Vanitha Patnala
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  3. Salla Gangi Reddy
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  4. Cleberson R. Alves
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Contributions

Vinny cris and Vanitha patnala have conducted the experiment and analysed the results. Vinny Cris has prepared initial manuscript which has been subsequently corrected by Vanitha, Gangi and Cleberson. The theoretical calculations have been done by Cleberson and Gangi. They also supervised the entire work.

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Correspondence to Salla Gangi Reddy.

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Cris, M.V., Patnala, V., Reddy, S.G. et al. Correlation between coherent and scattered optical vortices: diagnosis of the topological charge. Appl. Phys. B 129, 85 (2023). https://doi.org/10.1007/s00340-023-08027-6

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