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Depressed-cladding thulium-doped fiber for applications below 1800 nm.

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    We developed a novel thulium-doped fiber with a depressed cladding that acts as a filter. This design effectively suppresses amplified spontaneous emission (ASE) for improved performance in fiber laser applications.

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    Area of Science:

    • Materials Science
    • Optical Engineering
    • Laser Physics

    Background:

    • Thulium-doped fibers are crucial for generating light in specific wavelength ranges.
    • Amplified spontaneous emission (ASE) is a significant noise source that can degrade laser performance.
    • Controlling ASE is essential for optimizing fiber laser efficiency and output characteristics.

    Purpose of the Study:

    • To design and fabricate a thulium-doped silica fiber with a depressed cladding.
    • To utilize the depressed cladding as a distributed filter for amplified spontaneous emission (ASE).
    • To investigate the effectiveness and tunability of ASE filtering in the designed fiber.

    Main Methods:

    • Numerical modeling was employed for the fiber design process.
    • The fiber was fabricated using modified chemical vapor deposition (MCVD) and nanoparticle doping.
    • Experimental characterization was performed to assess ASE filtering performance.

    Main Results:

    • The depressed cladding effectively suppresses amplified spontaneous emission (ASE) at longer wavelengths.
    • The fiber promotes emission at shorter wavelengths due to the filtering effect.
    • ASE filtering effectiveness and tunability were demonstrated to be influenced by fiber bend radius.

    Conclusions:

    • The novel thulium-doped fiber with a depressed cladding offers an effective solution for ASE suppression.
    • This fiber design is suitable for applications requiring precise wavelength control below 1800 nm.
    • The tunability of ASE filtering by bending provides a practical method for performance adjustment.