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Hybrid generation and analysis of vector vortex beams.

Sandra Mamani, Ethan Bendau, Jeff Secor

    Applied Optics
    |April 5, 2017
    PubMed
    Summary

    Researchers generated optical vector vortex beams with combined orbital angular momentum and polarization states. This method uses a spatial light modulator and vortex retarder, preserving beam properties.

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    Area of Science:

    • Optics and Photonics
    • Quantum Information Science

    Background:

    • Orbital angular momentum (OAM) and polarization are key properties of light.
    • Vector vortex beams combine spatially inhomogeneous polarization and phase.
    • Generating beams with controlled superpositions of OAM states is challenging.

    Purpose of the Study:

    • To present a method for generating optical vector vortex beams with superpositions of orbital angular momentum states.
    • To experimentally characterize these beams and validate the theoretical model.

    Main Methods:

    • Tandem application of a spatial light modulator (SLM) and a vortex retarder.
    • Experimental characterization using imaging in an astigmatic system with a tilted lens.
    • Mathematical analysis of the Gouy phase for theoretical validation.

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    Main Results:

    • Successfully generated optical vector vortex beams with superpositions of OAM states.
    • Experimental images showed good agreement with mathematical analysis of the Gouy phase.
    • Demonstrated preservation of the vector polarization structure and OAM.

    Conclusions:

    • The described method effectively generates vector vortex beams with tunable OAM.
    • The technique preserves the polarization and OAM properties of the generated beams.
    • This work contributes to the development of advanced optical beam generation.