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Bismuth-doped all-fiber mode-locked laser operating at 1340  nm.

N K Thipparapu, C Guo, A A Umnikov

    Optics Letters
    |December 15, 2017
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    Summary

    This study presents a 1340 nm mode-locked Bismuth-doped fiber laser, achieving 1.15 W peak power without a saturable absorber. The laser demonstrates stable operation with a true pulse width of 1.2 ps.

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    Area of Science:

    • Photonics and Optics
    • Laser Physics
    • Materials Science

    Background:

    • Fiber lasers offer versatile platforms for generating optical pulses.
    • Bismuth-doped fibers are emerging as a promising gain medium for fiber lasers.
    • Mode-locked fiber lasers are crucial for various applications requiring ultrashort pulses.

    Purpose of the Study:

    • To demonstrate a 1340 nm mode-locked fiber laser utilizing Bismuth (Bi)-doped fiber.
    • To investigate the impact of pump power on pulse characteristics.
    • To achieve high peak power output through amplification.

    Main Methods:

    • Utilized a Bismuth (Bi)-doped fiber as the gain medium in a mode-locked laser cavity.
    • Employed a master oscillator power amplifier (MOPA) configuration for pulse amplification.
    • Analyzed pulse width using autocorrelation measurements.
    • Verified laser stability using radio-frequency spectrum analysis.

    Main Results:

    • Achieved stable mode-locking at 1340 nm without an external saturable absorber.
    • Observed pulse width variation from 1.5 to 3 ns with changing pump power.
    • Generated amplified output with a peak power of 1.15 W.
    • Measured a true pulse width of 1.2 ps due to soliton bunching.
    • Confirmed stable operation with a 6.3 MHz repetition rate and 65 dB signal-to-noise ratio.

    Conclusions:

    • Successfully demonstrated a compact and stable mode-locked Bismuth-doped fiber laser.
    • The MOPA configuration effectively amplified the laser output to watt-level peak power.
    • The results highlight the potential of Bi-doped fiber lasers for various applications.