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    We developed a fiber-based optical vortex beam source for broadband and tunable operation (1100-1400 nm). This source generates vector vortices with high purity, confirmed by shearing interferometry.

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    Area of Science:

    • Optics and Photonics
    • Fiber Optics
    • Laser Physics

    Background:

    • Optical vortex beams possess orbital angular momentum, enabling advanced applications.
    • Generating tunable and broadband optical vortices with high purity remains a significant challenge.

    Purpose of the Study:

    • To demonstrate a novel fiber-based source for generating broadband and tunable optical vortex beams.
    • To achieve vector vortices with specific total angular momenta (+2, 0, -2) in the 1100-1400 nm spectral range.

    Main Methods:

    • Utilized a two-mode birefringent PANDA fiber with stress-applying elements to convert linearly polarized (LP11) modes into vector vortices.
    • Generated broadband supercontinuum or tunable Raman solitons in the LP11 modes of a specialized birefringent microstructured fiber using two pulsed lasers.
    • Employed a Wollaston prism-based method for pure excitation of LP11 modes.

    Main Results:

    • Successfully generated vector optical vortices with total angular momenta of +2, 0, and -2.
    • Achieved broadband (1100-1400 nm) and tunable operation of the optical vortex beam source.
    • Experimentally confirmed high modal and polarization purities of the generated beams.
    • Verified the vortex nature of the output beams using shearing interferometry.

    Conclusions:

    • The demonstrated fiber-based source provides a versatile platform for generating high-purity optical vortex beams.
    • The method allows for broadband and tunable operation, expanding possibilities for optical manipulation and communication.