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Diffraction-limited, 10-W, 5-ns, 100-kHz, all-fiber laser at 1.55 μm.

I Pavlov, E Dülgergil, E Ilbey

    Optics Letters
    |May 3, 2014
    PubMed
    Summary

    This study presents an all-fiber laser system generating high-energy, nanosecond pulses at 1.55 μm. The system achieves 100 μJ pulse energy and 10 W average power, limited by nonlinear effects.

    Area of Science:

    • Fiber laser technology
    • Nonlinear optics
    • Semiconductor lasers

    Background:

    • Development of high-power fiber laser systems is crucial for various applications.
    • Existing systems face limitations in pulse energy and nonlinear effects.
    • Need for compact, efficient, and diffraction-limited beam sources.

    Purpose of the Study:

    • To report an all-fiber-integrated master-oscillator power amplifier (MOPA) system.
    • To achieve high pulse energy (100 μJ) and average power (10 W) at 1.55 μm.
    • To investigate and model nonlinear effects limiting peak power.

    Main Methods:

    • Utilized a distributed feedback semiconductor laser as the seed source.
    • Employed a standard single-mode fiber (Corning SMF-28) for system output.

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  • Developed numerical simulations based on six-level rate equations to model pulse propagation.
  • Measured amplified spontaneous emission using a fast acousto-optic modulator.

    • Main Results:

    • Generated 5-ns pulses with 100-μJ energy at a 100 kHz repetition rate (10 W average power).
    • Achieved a truly diffraction-limited beam, confirmed by M2 measurements.
    • Identified spectral broadening due to nonlinear effects (primarily four-wave mixing) as the peak power limitation.
    • Successfully minimized amplified spontaneous emission through numerical modeling.

    Conclusions:

    • The all-fiber MOPA system demonstrates efficient generation of high-energy, diffraction-limited pulses.
    • Nonlinear effects, particularly four-wave mixing, are key limitations for further peak power scaling.
    • Numerical modeling provides a valuable tool for optimizing fiber amplifier performance and minimizing unwanted effects.