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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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High-order mixed vortex beam generator.

Donghui Wang, Chengcheng Feng, Lingzhi Meng

    Optics Express
    |December 13, 2023
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    Summary
    This summary is machine-generated.

    Researchers developed a novel fiber optic device capable of generating mixed multi-order vortex beams. This innovation, using a Reuleaux triangle core fiber chiral grating, opens new possibilities for optical communications and imaging.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optics
    • Chiral Photonics

    Background:

    • Vortex beams, characterized by orbital angular momentum (OAM), have unique properties valuable for advanced optical applications.
    • Generating mixed-order vortex beams in a single fiber presents significant challenges due to mode coupling complexities.

    Purpose of the Study:

    • To propose and demonstrate a novel method for generating mixed multi-order vortex beams within a single fiber.
    • To investigate the underlying physics of mode coupling in a specially designed fiber structure.

    Main Methods:

    • Utilizing a Reuleaux triangle core fiber chiral grating (RCFG) as the core element.
    • Analyzing phase matching conditions using coupled mode theory.
    • Employing a cladding shrinkage technique to tune the co-coupling wavelength.

    Main Results:

    • Successfully generated a mixed vortex beam comprising 1st- and 3rd-order vortex modes simultaneously in a single chiral fiber.
    • Identified that balancing perturbations within the Reuleaux triangle core fiber (RTF) is crucial for co-coupling.
    • Demonstrated flexible adjustment of the co-coupling wavelength via cladding shrinkage.

    Conclusions:

    • The proposed RCFG offers a new and effective approach for generating mixed multi-order vortex beams.
    • This technology has potential applications in fiber OAM communications, optical tweezers, and super-resolution imaging.