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Related Experiment Video

Updated: Jun 19, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Coherent beam combination of three two-tone fiber amplifiers using stochastic parallel gradient descent algorithm.

Pu Zhou1, Yanxing Ma, Xiaolin Wang

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

Optics Letters
|October 2, 2009
PubMed
Summary

Multitone radiation effectively mitigates stimulated Brillouin scattering in fiber amplifiers. Coherent beam combination using a stochastic parallel gradient descent algorithm proved successful without a single-frequency seed laser.

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Last Updated: Jun 19, 2026

Quasi-light Storage for Optical Data Packets
07:45

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Area of Science:

  • Optics and Photonics
  • Laser Physics
  • Fiber Optics

Background:

  • Stimulated Brillouin scattering (SBS) is a major limitation in high-power narrow-linewidth fiber amplifiers.
  • Multitone radiation offers a potential solution to suppress SBS.
  • Coherent beam combination (CBC) is crucial for scaling fiber laser power.

Purpose of the Study:

  • To demonstrate the coherent beam combination of multiple two-tone fiber amplifiers.
  • To investigate the effectiveness of multitone radiation in mitigating SBS.
  • To validate the use of a stochastic parallel gradient descent (SPGD) algorithm for phase control in CBC.

Main Methods:

  • Utilized three two-tone fiber amplifiers emitting multitone radiation.
  • Implemented a stochastic parallel gradient descent (SPGD) algorithm for real-time phase control.
  • Employed a digital signal processor (DSP) to execute the SPGD algorithm.
  • Characterized the far-field intensity pattern of the coherently combined beam.

Main Results:

  • Achieved coherent beam combination of three fiber amplifiers.
  • Demonstrated a high contrast ratio (>85%) in the far-field intensity pattern of the combined beam.
  • Validated the efficacy of the SPGD algorithm for precise phase control.
  • Showcased that a single-frequency seed laser is not required for CBC in a master oscillator power amplifier (MOPA) configuration.

Conclusions:

  • Multitone radiation is an effective technique for SBS mitigation in fiber amplifiers.
  • SPGD algorithm enables successful coherent beam combination of fiber amplifiers.
  • CBC is feasible without a single-frequency seed laser, simplifying MOPA system design.