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Characterizing coherence vortices through geometry.

Cleberson R Alves, Alcenísio J Jesus-Silva, Eduardo J S Fonseca

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    Researchers created coherence vortices using light beams, finding a linear relationship between vortex order and bright ring/dark area size. This allows for estimating vortex orders, including fractional ones, by measuring these areas.

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    Area of Science:

    • Optics and Photonics
    • Light-Matter Interactions

    Background:

    • Orbital angular momentum (OAM) in light beams enables the formation of complex optical structures.
    • Coherence vortices are characterized by phase singularities and structured intensity profiles.

    Purpose of the Study:

    • To experimentally and numerically investigate coherence vortices generated by OAM.
    • To study the relationship between the order of coherence vortices and their spatial characteristics (bright ring area, dark region).
    • To establish a method for estimating vortex orders based on measurable parameters.

    Main Methods:

    • Generation of coherence vortices using laser beams with specific orbital angular momentum.
    • Numerical simulations to model vortex formation and properties.
    • Experimental characterization of vortex intensity profiles and measurement of bright ring and dark areas.

    Main Results:

    • A linear dependence was observed between the order of coherence vortices and their bright ring area or dark region.
    • The slope of this linear relationship is proportional to the measured areas.
    • Demonstrated the feasibility of estimating vortex orders, including fractional orders, from these area measurements.

    Conclusions:

    • The spatial extent of coherence vortices scales linearly with their order.
    • Measuring the bright ring or dark area provides a direct method for determining the order of coherence vortices.
    • This finding offers a practical approach for characterizing complex light beam structures.