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Related Experiment Video

Updated: Feb 5, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Bidirectional mode-locked thulium-doped fiber laser.

Nurmemet Abdukerim, M Imrul Kayes, Alexandre Rekik

    Applied Optics
    |September 6, 2018
    PubMed
    Summary

    We developed a bidirectional thulium-doped fiber laser using semiconductor saturable absorption and nonlinear polarization rotation. This laser generates two stable picosecond pulse trains in opposite directions, with tunable output wavelengths.

    Area of Science:

    • Photonics and Laser Technology
    • Fiber Optics
    • Nonlinear Optics

    Background:

    • Fiber lasers offer compact and robust platforms for generating laser light.
    • Mode-locking is crucial for producing ultrashort laser pulses.
    • Bidirectional operation in lasers can enable unique applications.

    Purpose of the Study:

    • To demonstrate a novel bidirectional mode-locked thulium-doped fiber laser.
    • To investigate the combined effect of semiconductor saturable absorption and nonlinear polarization rotation for mode-locking.
    • To characterize the generated picosecond pulse trains and their tunability.

    Main Methods:

    • Utilized a thulium-doped fiber as the gain medium.
    • Implemented a hybrid mode-locking mechanism combining semiconductor saturable absorber mirror (SESAM) and nonlinear polarization rotation (NPR).

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  • Analyzed the output characteristics including pulse duration, repetition rate, and spectral properties.

    • Main Results:

    • Achieved stable bidirectional mode-locking in the thulium-doped fiber laser.
    • Generated two independent picosecond pulse trains propagating in opposite directions.
    • Observed a fundamental repetition rate of approximately 16.57 MHz for both pulse trains.
    • Demonstrated wavelength tunability over a 35 nm range.

    Conclusions:

    • The hybrid mode-locking technique effectively enables bidirectional operation in thulium-doped fiber lasers.
    • The developed laser provides tunable picosecond pulses, suitable for various spectroscopic and nonlinear optical applications.
    • This work presents a promising approach for advanced fiber laser systems.