4.45 kW narrow linewidth FBG-based MOPA configuration fiber laser with near-diffraction limited beam quality

Xin Tian; Binyu Rao; Meng Wang; Xiaoming Xi; Chongwei Wang; Hao Li; Zefeng Wang

doi:10.1117/12.2652111

10 May 2023 4.45 kW narrow linewidth FBG-based MOPA configuration fiber laser with near-diffraction limited beam quality

Xin Tian, Binyu Rao, Meng Wang, Xiaoming Xi, Chongwei Wang, Hao Li, Zefeng Wang

Author Affiliations +

Proceedings Volume 12554, AOPC 2022: Advanced Laser Technology and Applications; 125540G (2023) https://doi.org/10.1117/12.2652111
Event: Applied Optics and Photonics China 2022 (AOPC2022), 2022, Beijing, China

Abstract

In this paper, we have experimentally demonstrated a 4.45 kW master oscillator power amplification (MOPA) narrow-linewidth fiber laser based on fiber Bragg grating (FBG) with near-diffraction limited beam quality. By optimizing the structure of narrow linewidth fiber oscillator seed, the temporal characteristics of injected seed laser is improved. Combined with optimizing pumping ratio of amplifier stage, multiple nonlinear effects are mitigated. Finally, a 4.45 kW narrow linewidth laser output with near-diffraction limited beam quality is achieved with a slope efficiency of 80.2%. The signal to noise ratio is 24.5 dB at the maximum power. The 3 dB and 20 dB bandwidth are 0.5 nm and 3.63 nm, respectively.

Citation Download Citation

Xin Tian, Binyu Rao, Meng Wang, Xiaoming Xi, Chongwei Wang, Hao Li, and Zefeng Wang "4.45 kW narrow linewidth FBG-based MOPA configuration fiber laser with near-diffraction limited beam quality", Proc. SPIE 12554, AOPC 2022: Advanced Laser Technology and Applications, 125540G (10 May 2023); https://doi.org/10.1117/12.2652111

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KEYWORDS

Fiber lasers

Fiber Bragg gratings

Oscillators

Fiber amplifiers

Optical amplifiers

Amplifiers

Cladding

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