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Sampling a vortex from a Gaussian beam using a wedge-plate shearing interferometer.

William R Kerridge-Johns, Jean-Benoît Jaillot, Michael J Damzen

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    |May 13, 2021
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    Summary
    This summary is machine-generated.

    Researchers developed the simplest vortex beam generation method using a wedge-plate shearing interferometer (WPSI). This technique efficiently produces high-purity Laguerre-Gaussian vortex beams from Gaussian beams, ideal for various applications.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics

    Background:

    • Vortex beams, characterized by orbital angular momentum, have diverse applications.
    • Existing vortex generation methods can be complex and costly.

    Purpose of the Study:

    • To introduce a simplified and highly efficient method for generating vortex beams.
    • To demonstrate the capability of the wedge-plate shearing interferometer (WPSI) for vortex beam generation.

    Main Methods:

    • Utilizing a monolithic wedge-plate shearing interferometer (WPSI).
    • Employing a fundamental Gaussian beam as input.

    Main Results:

    • Achieved theoretical purity of >99% for a first-order Laguerre-Gaussian vortex beam (LG01).
    • Experimentally demonstrated 98% LG01 purity.
    • Showcased 1% power conversion efficiency with potential for 14%.

    Conclusions:

    • The WPSI offers a simple, compact, and stable solution for vortex beam generation.
    • This method is suitable for applications requiring robust, high-purity vortex beams, such as metrology and education.
    • The WPSI is adaptable to any wavelength within the material's transparency range.