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Related Experiment Video

Updated: Jul 1, 2025

Low-cost Custom Fabrication and Mode-locked Operation of an All-normal-dispersion Femtosecond Fiber Laser for Multiphoton Microscopy
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Compound four-cavity single-longitudinal mode fiber laser.

Huiping Chen, Jun Yang, Shuxiang Song

    Optics Express
    |March 5, 2024
    PubMed
    Summary

    This study presents a novel erbium-doped fiber laser operating in a single longitudinal mode. The laser achieves stable single-frequency output with a narrow linewidth and high signal-to-noise ratio.

    Area of Science:

    • Photonics and Laser Technology
    • Optical Engineering
    • Materials Science

    Background:

    • Single longitudinal mode (SLM) fiber lasers are crucial for applications requiring narrow linewidth and high coherence.
    • Traditional methods for achieving SLM operation often involve complex cavities or bulky components.
    • Erbium-doped fiber lasers (EDFLs) are widely used in telecommunications and sensing due to their emission in the 1550 nm window.

    Purpose of the Study:

    • To propose and experimentally verify a compound resonant cavity-type EDFL for stable single-frequency operation.
    • To investigate the role of a compound four-cavity and a fiber grating Fabry-Perot (F-P) filter in achieving SLM output.
    • To optimize the laser design for a narrow linewidth, high optical signal-to-noise ratio (OSNR), and stable output.

    Main Methods:

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    • A compound four-cavity design was employed to increase longitudinal mode spacing.
    • A homemade grating F-P filter and a saturable absorber were used to narrow the gain spectral bandwidth.
    • Theoretical analysis and experimental verification were conducted to validate the laser components' performance.
    • Delayed self-heterodyne method was utilized to measure the laser linewidth.

    Main Results:

    • The proposed laser successfully achieved single longitudinal mode operation.
    • The center wavelength of the laser output was measured at 1550.06 nm.
    • An optical signal-to-noise ratio (OSNR) of 65 dB was achieved.
    • The laser exhibited a maximum power fluctuation of 0.28 dB over a 50-minute period.
    • The output linewidth was measured to be approximately 250 Hz.

    Conclusions:

    • The compound resonant cavity design effectively enables stable single-frequency operation in EDFLs.
    • The combination of a broadband gain medium, a compound cavity, and spectral filtering is a viable approach for high-performance fiber lasers.
    • The demonstrated laser offers excellent spectral purity and stability, suitable for advanced optical applications.