Phase conjugated master oscillator fiber power amplifier
Tingwei Gu, Xin Zeng, Huawei Jiang, Suming Luo, Maokai Yang, Xuezong Yang, Yan Feng

TL;DR
This paper introduces an all-optical method using optical phase conjugation to narrow spectral linewidth and suppress stimulated Brillouin scattering in high-power fiber lasers, simplifying system design and enabling higher power scaling.
Contribution
The study demonstrates a novel all-optical approach employing optical phase conjugation for linewidth narrowing and SBS suppression, avoiding complex modulation techniques.
Findings
Achieved spectral compression ratio over 3 times
Demonstrated effective SBS suppression in fiber amplifiers
Simplified high-power fiber laser architecture
Abstract
High-power narrow-linewidth fiber lasers are fundamentally limited by stimulated Brillouin scattering (SBS), which constrains further power scaling while maintaining spectral linewidth. Traditional mitigation techniques, such as active phase modulation, often introduce trade-offs among complexity, cost, and spectral brightness. In this study, we propose and experimentally demonstrate a novel all-optical approach for spectral linewidth manipulation and SBS suppression using optical phase conjugation (OPC). By leveraging nonlinear spectral broadening followed by phase conjugation, this method enables sophisticated linewidth narrowing in fiber amplifier, resulting in narrow linewidth output and enhanced SBS threshold. Using a low-cost fiber oscillator as the seed source, we achieve a spectral compression ratio exceeding 3 times. This method not only eliminates the need for complex…
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Taxonomy
TopicsPhotonic Crystal and Fiber Optics · Advanced Fiber Laser Technologies · Photorefractive and Nonlinear Optics
