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Highly efficient few-mode spatial beam self-cleaning at 1.5µm.

Y Leventoux, A Parriaux, O Sidelnikov

    Optics Express
    |May 15, 2020
    PubMed
    Summary
    This summary is machine-generated.

    Spatial beam self-cleaning is highly efficient in graded-index multimode optical fibers using few-mode excitation. This method significantly lowers the power threshold for achieving self-cleaning, enhancing beam stability.

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    Area of Science:

    • Nonlinear optics
    • Optical fiber communications
    • Photonics

    Background:

    • Spatial beam self-cleaning enhances beam quality in optical fibers.
    • Previous methods required higher power thresholds and specific wavelengths.
    • Few-mode excitation in graded-index fibers offers potential for improved efficiency.

    Purpose of the Study:

    • To experimentally demonstrate efficient spatial beam self-cleaning.
    • To investigate the effect of few-mode excitation on the power threshold.
    • To analyze the spatio-temporal stability of self-cleaned beams.

    Main Methods:

    • Utilizing few-mode excitation in graded-index multimode optical fibers.
    • Employing 160 ps long, highly chirped optical pulses at 1562 nm.
    • Comparing results with previous experiments using different wavelengths (1030-1064 nm).

    Main Results:

    • Achieved a one-decade reduction in the power threshold for spatial beam self-cleaning.
    • Demonstrated high spatio-temporal stability of self-cleaned beams over a wide power range.
    • Investigated the influence of input pulse temporal duration on the self-cleaning process.

    Conclusions:

    • Few-mode excitation in graded-index fibers enables highly efficient spatial beam self-cleaning.
    • The demonstrated method significantly lowers power requirements and enhances beam stability.
    • This approach holds promise for advanced optical communication systems.