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Generation of perfect vectorial vortex beams.

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    We introduce perfect vectorial vortex beams (VVBs) with stable intensity and polarization profiles during propagation. These beams offer potential for information encoding and quantum cryptography applications.

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    Area of Science:

    • Optical physics
    • Quantum optics
    • Beam propagation

    Background:

    • Vectorial vortex beams (VVBs) are crucial for advanced optical applications.
    • Maintaining beam characteristics like intensity and polarization during propagation is challenging.

    Purpose of the Study:

    • To propose and demonstrate perfect vectorial vortex beams (VVBs) with stable propagation properties.
    • To explore the potential of VVBs in information encoding and quantum cryptography.

    Main Methods:

    • Theoretical proposal of perfect VVBs.
    • Approximate generation of perfect VVBs using a Sagnac interferometer.
    • Experimental demonstration of stable intensity profiles and states of polarization (SoP) upon propagation.

    Main Results:

    • Perfect VVBs exhibit intensity profiles independent of polarization order and topological charge.
    • Generated VVBs maintain stable intensity profiles and SoP over a certain propagation distance.
    • Demonstrated feasibility of generating VVBs with locally linear and elliptical polarizations.

    Conclusions:

    • Perfect VVBs represent a significant advancement in beam stability and control.
    • These beams hold promise for applications in optical information encoding and quantum cryptography.
    • VVBs can enhance the conversion of spin and orbital angular momenta.