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Optical vortex switch based on multiplexed volume gratings with high diffraction efficiency.

Jingyin Zhao, Yunxia Jin, Fanyu Kong

    Optics Express
    |November 23, 2021
    PubMed
    Summary
    This summary is machine-generated.

    We developed a compact optical vortex switch using a multiplexed volume grating (MVG) in PTR glass. This device offers high conversion efficiency and polarization insensitivity, advancing optical communication and vortex applications.

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    Area of Science:

    • Optics and Photonics
    • Materials Science

    Background:

    • Controllable orbital angular momentum (OAM) systems need improved compactness, higher conversion efficiency, and tolerance to wavelength/polarization variations.
    • Existing optical vortex switches often face limitations in these performance aspects.

    Purpose of the Study:

    • To introduce and characterize a novel optical vortex switch based on a multiplexed volume grating (MVG).
    • To investigate the performance of the MVG switch, focusing on diffraction efficiency (DE) and its dependence on incident parameters.

    Main Methods:

    • Fabrication of an MVG within photo-thermo-refractive (PTR) glass.
    • Experimental evaluation of the MVG's diffraction efficiency and angular selectivity.
    • Analysis of the impact of incident divergence angle and polarization on DE and far-field diffraction patterns.

    Main Results:

    • The MVG exhibits high diffraction efficiency (conversion efficiency) and sensitive angular selectivity.
    • The device demonstrates remarkable polarization-insensitivity, with DE fluctuations below 1.59%.
    • Incident divergence angle significantly influences the diffraction efficiency.

    Conclusions:

    • The developed MVG optical vortex switch meets critical requirements for OAM systems, including compactness and high efficiency.
    • The switch's polarization insensitivity and tunable angular selectivity make it a promising candidate for advanced optical applications.
    • Potential applications include vortex tweezers, optical communication systems, and high-power beam steering.