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Highly efficient, depressed-cladding thulium-doped fiber laser at 1762 nm.

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    Researchers developed a new all-fiber laser emitting at 1.76-μm. This fiber laser, using depressed-cladding Tm-doped fiber (dc-TDF), achieved multi-watt output power, mitigating amplified spontaneous emission (ASE).

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    Area of Science:

    • Fiber laser technology
    • Optoelectronics
    • Laser physics

    Background:

    • Continuous-wave (CW) fiber lasers operating in the 1.7-μm range are crucial for various applications.
    • Mitigating long-wavelength amplified spontaneous emission (ASE) is a key challenge in achieving high-power 1.7-μm fiber lasers.
    • Thulium-doped fibers (TDFs) are commonly used gain media for this wavelength range.

    Purpose of the Study:

    • To demonstrate a multi-watt-level, continuous-wave (CW) all-fiber laser operating at 1.76-μm.
    • To investigate the use of in-house-drawn depressed-cladding Tm-doped fiber (dc-TDF) as an active medium to suppress amplified spontaneous emission (ASE).
    • To achieve high output power and efficiency using resonant pumping.

    Main Methods:

    • Utilized a linear cavity configuration for the all-fiber laser.
    • Employed an in-house-drawn depressed-cladding Tm-doped fiber (dc-TDF) as the active gain medium.
    • Implemented resonant pumping at 1.56-μm to excite the thulium ions.

    Main Results:

    • Achieved a continuous-wave (CW) output power of 2.47 W in a linear cavity configuration.
    • Demonstrated a high slope efficiency of 75.8% relative to launched power.
    • Attained over 4 W output power with bidirectional pumping and a slope efficiency of 66%.
    • Maintained an optical signal-to-noise ratio (SNR) exceeding 65 dB.

    Conclusions:

    • Successfully demonstrated the first 1.7-μm laser operation utilizing depressed-cladding Tm-doped fibers (dc-TDFs).
    • The use of dc-TDF effectively mitigated long-wavelength amplified spontaneous emission (ASE).
    • The developed all-fiber laser offers a promising solution for high-power 1.76-μm light generation.