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Visible optical vortices measured with bulk lateral shearing interferometry.

Miguel López-Ripa, Íñigo Sola, Benjamín Alonso

    Optics Express
    |June 14, 2025
    PubMed
    Summary

    Researchers generated visible ultrafast optical vortices using nonlinear up-conversion. Bulk lateral shearing interferometry was demonstrated to characterize these visible vortex pulses, showing its versatility across spectral regions.

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    Area of Science:

    • Quantum Optics and Photonics
    • Ultrafast Laser Science
    • Nonlinear Optics

    Background:

    • Ultrafast pulse optical vortices are crucial spatiotemporal structures with broad applications.
    • Current generation methods are often wavelength-restricted, limiting their utility.
    • Existing characterization techniques share similar spectral limitations.

    Purpose of the Study:

    • To generate ultrashort optical vortices in the visible spectrum.
    • To demonstrate a versatile spatiotemporal characterization method for these visible pulses.
    • To validate the use of bulk lateral shearing interferometry across different spectral regions.

    Main Methods:

    • Generation of near-infrared ultrafast optical vortices using Ti:sapphire laser pulses, structured waveplates, and beam manipulation.
    • Visible vortex production via second-harmonic generation (up-conversion).
    • Spatiotemporal characterization using bulk lateral shearing interferometry and temporal characterization via the amplitude swing technique.

    Main Results:

    • Successful generation of visible ultrafast optical vortices.
    • Experimental validation of the visible vortex generation.
    • Demonstration that bulk lateral shearing interferometry can characterize pulsed beams across widely different spectral regions using the same setup.

    Conclusions:

    • Visible ultrafast optical vortices can be generated through nonlinear up-conversion.
    • Bulk lateral shearing interferometry is a robust and versatile technique for characterizing ultrafast pulsed beams in both near-infrared and visible spectral regions.
    • This finding broadens the applicability of optical vortices and their characterization for future scientific and technological advancements.