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Related Experiment Video

Updated: Feb 24, 2026

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy

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Single-longitudinal-mode broadband tunable random laser.

Heba Shawki, Hussein Kotb, Diaa Khalil

    Optics Letters
    |August 16, 2017
    PubMed
    Summary
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    We developed a tunable single-longitudinal-mode (SLM) random fiber laser with a broad 1500-1570 nm tuning range. This broadband laser operates across S, C, and L bands, offering versatile applications.

    Area of Science:

    • Photonics and Optics
    • Fiber Lasers
    • Random Lasers

    Background:

    • Single-longitudinal-mode (SLM) lasers are crucial for applications requiring narrow spectral output.
    • Achieving broadband tunability in SLM fiber lasers remains a challenge.
    • Random lasers offer unique spectral properties based on diffusive feedback.

    Purpose of the Study:

    • To demonstrate a broadband tunable SLM random laser.
    • To utilize Rayleigh backscattering in standard single-mode fiber for laser operation.
    • To achieve wide tuning range and narrow linewidth in a fiber-based laser system.

    Main Methods:

    • Employing a standard single-mode fiber as the gain medium and utilizing Rayleigh backscattering for feedback.
    • Integrating a tunable bandpass Fabry-Perot filter for wavelength selection and tuning.

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  • Using a wide-bandwidth semiconductor optical amplifier as the gain source.

    • Main Results:

    • Demonstrated a broadband tunable SLM fiber laser operating from 1500 nm to 1570 nm.
    • Achieved a narrow linewidth ranging from 4.5 kHz to 30 kHz across the tuning band.
    • Confirmed laser operation across the S, C, and L optical communication bands.

    Conclusions:

    • The developed SLM random fiber laser offers a wide tuning range and narrow linewidth.
    • Rayleigh backscattering in standard single-mode fiber is an effective mechanism for broadband SLM random lasing.
    • The laser's performance across S+C+L bands makes it suitable for various optical sensing and communication applications.