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Photonic lantern kW-class fiber amplifier.

Juan Montoya, Christopher Hwang, Dale Martz

    Optics Express
    |November 3, 2017
    PubMed
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    High-power operation of multimode fiber amplifiers was achieved using adaptive mode control. This technique compensates for mode fluctuations, enabling stable kW-class output for advanced laser applications.

    Area of Science:

    • Laser Physics and Photonics
    • Optical Engineering
    • Fiber Optics

    Background:

    • Multimode fiber amplifiers offer potential for high-power laser generation.
    • Maintaining beam quality and mode stability at high power levels is a significant challenge.
    • Existing methods often struggle with dynamic mode fluctuations in high-power systems.

    Purpose of the Study:

    • To demonstrate kW-class power operation in a multimode fiber amplifier.
    • To implement adaptive mode control for stable high-power output.
    • To investigate the use of a photonic lantern front end for mode management.

    Main Methods:

    • Utilized a photonic lantern front end to combine three single-mode fiber inputs.
    • Employed adaptive optics to control the superposition of input modes in a three-mode gain fiber.

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  • Dynamically adjusted phase, amplitude, and polarization of input signals to compensate for mode fluctuations.

    • Main Results:

    • Achieved pump-limited kW-class operation in the multimode fiber amplifier.
    • Successfully compensated for mode fluctuations at high power levels through adaptive control.
    • Demonstrated the ability to achieve a desired output mode by controlling input mode superposition.

    Conclusions:

    • Adaptive mode control is effective for achieving high-power, stable operation in multimode fiber amplifiers.
    • The photonic lantern front end is a viable solution for managing multiple input modes.
    • This approach shows promise for further power scaling and advanced adaptive-optic compensation in fiber lasers.