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Deep learning for simultaneous phase and amplitude identification in coherent beam combination.

Fedor Chernikov1, Yunhui Xie2, James A Grant-Jacob2

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A new deep learning algorithm enables simultaneous phase and amplitude identification for fibre laser beam combination, even with power fluctuations. This advances phase locking for high-power laser systems.

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Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Artificial Intelligence

Background:

  • Coherent beam combination (CBC) enhances fibre laser power but requires precise phase control.
  • Traditional phase retrieval algorithms struggle with power fluctuations common in operational fibre lasers.
  • Existing methods often assume stable power levels, limiting practical CBC applications.

Purpose of the Study:

  • To develop a robust phase retrieval method for CBC systems that accommodates power fluctuations.
  • To enable simultaneous identification of phase and amplitude directly from combined beam intensity.
  • To assess the performance and scalability of the proposed deep learning approach.

Main Methods:

  • A deep learning algorithm was designed for single-step phase and amplitude retrieval.
  • The algorithm analyzes intensity patterns from a single camera observation of the combined beam.
  • Simulations using a spatial light modulator investigated power fluctuation effects and scalability with increasing beamlets.

Main Results:

  • The deep learning algorithm accurately disentangles phase and power, even with significant power fluctuations.
  • Systematic investigation confirmed the impact of power-level fluctuations on phase retrieval accuracy.
  • Scalability analysis demonstrated the approach's ability to maintain precision with more beamlets.

Conclusions:

  • Deep learning offers a robust solution for phase and amplitude retrieval in CBC systems facing power degradation.
  • The proposed method overcomes limitations of traditional algorithms under non-ideal power conditions.
  • This approach enhances the practicality and scalability of high-power fibre laser systems.