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Active phasing a nine-element 1.14 kW all-fiber two-tone MOPA array using SPGD algorithm.

Xiaolin Wang1, Pu Zhou, Yanxing Ma

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

Optics Letters
|August 18, 2011
PubMed
Summary
This summary is machine-generated.

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We achieved active phase locking in a nine-element fiber laser array using the SPGD algorithm. This method significantly improved the laser array

Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Fiber Lasers

Background:

  • High-power fiber laser arrays are crucial for various applications.
  • Achieving coherent beam combination from multiple fiber amplifiers presents significant challenges.
  • Phase locking is essential for maximizing the output power and beam quality.

Purpose of the Study:

  • To demonstrate active phase locking of a nine-element all-fiber master-oscillator power amplifier (MOPA) array.
  • To utilize the stochastic parallel gradient descent (SPGD) algorithm for blind phase control.
  • To enhance the performance of high-power fiber laser systems.

Main Methods:

  • Employing two spectrally combined single-frequency seed lasers as the master oscillator.
  • Configuring a 3x3 laser array with a 40% fill factor.

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Last Updated: May 30, 2026

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  • Implementing the SPGD blind optimization algorithm for active phase control.

    • Main Results:

    • Achieved a 4.1-fold increase in the metric function with the SPGD controller enabled.
    • Obtained interference pattern visibility exceeding 90% at the receiving plane.
    • Reduced the computed phase residual error to less than λ/15, despite channel phase fluctuations.

    Conclusions:

    • Active phase locking of a 1.1 kW all-fiber MOPA array is feasible using the SPGD algorithm.
    • The SPGD algorithm effectively compensates for phase fluctuations in high-power fiber laser arrays.
    • Demonstrated a robust method for coherent beam combination in large fiber laser systems.