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Ultrafast optical vortex beam generation in the ultraviolet.

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    PubMed
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    Researchers generated ultrafast vortex beams in the deep ultraviolet (DUV) range for the first time. This breakthrough in DUV vortex beam generation opens new avenues for scientific research.

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    Area of Science:

    • Optics and Photonics
    • Ultrafast Laser Science
    • Nonlinear Optics

    Background:

    • Vortex beams possess unique helical wavefronts, enabling advanced optical applications.
    • Generating vortex beams in the deep ultraviolet (DUV) presents significant technical challenges.
    • Ultrafast light sources are crucial for high-resolution imaging and material processing.

    Purpose of the Study:

    • To achieve the first-ever generation of ultrafast vortex beams in the deep ultraviolet (DUV) wavelength range.
    • To develop a novel method for producing high-order UV vortex beams with high power and stability.
    • To explore the potential of DUV vortex beams in advanced scientific and technological applications.

    Main Methods:

    • Utilized a Yb-fiber-based green laser source.
    • Employed two spiral phase plates (orders 1 and 2) to generate picosecond Laguerre-Gaussian (LG) beams at 532 nm.
    • Implemented single-pass, second-harmonic generation in a β-BaB2O4 crystal to convert green LG beams to DUV vortex beams at 266 nm.

    Main Results:

    • Successfully generated ultrafast vortex beams at 266 nm, a DUV wavelength.
    • Achieved vortex orders as high as 12.
    • Obtained up to 383 mW of DUV power with a 5.2% green-to-DUV conversion efficiency.
    • The generated beams exhibited a spectral width of 1.02 nm and power stability better than 1.2% rms over 1.5 hours.

    Conclusions:

    • Demonstrated a pioneering method for generating high-order ultrafast vortex beams in the DUV spectral region.
    • The developed technique offers a viable route for producing powerful and stable DUV vortex beams.
    • This advancement is expected to drive progress in fields requiring precise light-matter interactions in the DUV range.