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    Multimode fiber saturable absorbers can generate ultrafast laser pulses. New findings show nonlinear interactions and wavelength-dependent transmission, not just intermodal nonlinearities, are key to their function.

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    Area of Science:

    • Optics and Photonics
    • Laser Physics
    • Nonlinear Optics

    Background:

    • Multimode fiber (MMF) saturable absorbers are crucial for mode-locking lasers, enabling ultrafast pulse generation.
    • Previous studies focused on continuous-wave (CW) analyses, attributing saturable absorption primarily to nonlinear interactions between transverse modes.

    Purpose of the Study:

    • To investigate the mechanisms behind saturable absorption in MMF-based devices.
    • To determine the role of single-mode fiber (SMF) nonlinearity and MMF wavelength-dependent transmission.
    • To assess the sufficiency of CW analysis for long MMFs.

    Main Methods:

    • Experimental investigation of MMF-based saturable absorbers.
    • Analysis of nonlinear interactions and wavelength-dependent linear transmission.
    • Comparison of CW limit analysis with experimental results for varying MMF lengths.

    Main Results:

    • Saturable absorption achieved through SMF nonlinearity and MMF wavelength-dependent linear transmission, even with minimal intermodal nonlinearities.
    • CW analysis found insufficient for long MMFs, even when intermodal nonlinearities are significant.
    • Demonstrated a new mechanism for saturable absorption in MMFs.

    Conclusions:

    • The mechanisms of MMF saturable absorbers are more complex than previously thought, involving SMF nonlinearity and MMF transmission properties.
    • Understanding these mechanisms is vital for advancing ultrafast laser technology.
    • Opens avenues for developing novel programmable devices for ultrafast optical control.