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Random distributed feedback fiber laser at 2.1  μm.

Xiaoxi Jin, Zhaokai Lou, Hanwei Zhang

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    |November 3, 2016
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    This study presents the first random distributed feedback fiber laser operating at 2.1 μm, utilizing Raman gain. The novel laser achieved 0.5 W output power with 9% efficiency, paving the way for new mid-infrared applications.

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    Area of Science:

    • Photonics and Laser Technology
    • Materials Science
    • Optical Engineering

    Background:

    • Fiber lasers are crucial for various applications, but achieving specific wavelengths like the 2 μm band remains challenging.
    • Random distributed feedback (RDFB) lasers offer a unique approach to laser design, potentially enabling new spectral ranges.

    Purpose of the Study:

    • To demonstrate a novel random distributed feedback fiber laser operating in the 2 μm wavelength band.
    • To investigate the use of Raman gain in a highly GeO2-doped silica fiber for RDFB laser applications.
    • To characterize the performance of the developed 2.1 μm fiber laser.

    Main Methods:

    • Utilized a high-power pulsed thulium-doped fiber laser (1.94 μm) as the pump source.
    • Employed a 150 m long, highly GeO2-doped silica fiber as the gain medium, providing Raman gain and RDFB.
    • Characterized the output power and optical efficiency of the fiber laser.

    Main Results:

    • Successfully demonstrated a random distributed feedback fiber laser at 2.1 μm.
    • Achieved a maximum output power of 0.5 W with an optical efficiency of 9%.
    • The results indicate potential for further improvement with increased pump power and optimized fiber length.

    Conclusions:

    • This work represents the first demonstration of a random distributed feedback fiber laser in the 2 μm band leveraging Raman gain.
    • The developed laser technology holds promise for future advancements in mid-infrared laser sources.
    • Further optimization could lead to enhanced power and efficiency for practical applications.