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Coherent beam combination of a hexagonal distributed high power fiber amplifier array.

Pu Zhou1, Yanxing Ma, Xiaolin Wang

  • 1College of Optoelectric Science and Engineering, National University of Defense Technology, Changsha 410073, China.

Applied Optics
|November 26, 2009
PubMed
Summary

Researchers achieved coherent beam combination from six fiber amplifiers in a hexagonal array, reaching 73.5 W output power. This high-power fiber amplifier array demonstrates efficient beam combining for advanced laser applications.

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Area of Science:

  • Optics and Photonics
  • Laser Technology
  • High-Power Fiber Lasers

Background:

  • High-power fiber lasers are crucial for various applications, but scaling output power requires combining multiple laser sources.
  • Coherent beam combination (CBC) offers a path to high-power lasers by merging the output of individual amplifiers.
  • Challenges in CBC include precise phase control and efficient beam combining architectures.

Purpose of the Study:

  • To demonstrate the coherent beam combination of a hexagonal array of high-power fiber amplifiers.
  • To develop and implement a robust phase control system for achieving efficient CBC.
  • To evaluate the performance of the hexagonal CBC system in terms of output power and beam quality.

Main Methods:

  • Utilized six polarization-maintained fiber amplifiers arranged in a hexagonal configuration.

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  • Employed a novel beam combiner to tile the individual amplifier outputs.
  • Implemented a stochastic parallel gradient descent algorithm on a digital signal processor for phase control signal generation.
  • Operated the system in a closed-loop configuration for active phase stabilization.

    • Main Results:

    • Successfully achieved coherent beam combination of the hexagonal fiber amplifier array.
    • Demonstrated a total output power of 73.5 W from the combined beams.
    • Attained a high contrast ratio of 81% for the coherent combined beam profile under closed-loop control.

    Conclusions:

    • The hexagonal distributed high-power fiber amplifier array is a viable architecture for efficient coherent beam combination.
    • The developed phase control system effectively stabilizes the combined beam, leading to high contrast and power.
    • This work advances the development of high-power, high-beam-quality fiber laser systems.