Abstract

In this Letter, the amplified spontaneous emission (ASE) effect of a 1030 nm fiber laser is studied theoretically and, based on the theoretical results, a 3 kW high optical signal-to-noise ratio (OSNR) 1030 nm fiber amplifier with a 180 pm linewidth and near-diffraction-limited beam quality is achieved. A theoretical model, which takes simulate ASE light falling in the range of Raman light as the Raman seed, has been used to optimize the power scaling capability of 1030 nm fiber amplifiers. It shows that the SRS effect seeded by the ASE is the main limiting factor for the fiber amplifiers operating at 1030 nm, and ${\gt}{3}\;{\rm kW}$ output power with a high OSNR can be achieved by proper parameter designing of the fiber laser system. A 1030 nm monolithic narrow linewidth fiber amplifier, which delivers 3 kW output power with the OSNR being 37 dB and a 0.18 nm spectrum linewidth, has been demonstrated. At the maximum 3 kW output power, the SRS light peak is obviously higher than ASE light, which agrees with the theoretical predictions. Neither a stimulated Brillouin scattering effect nor a thermal-induced mode instability effect has been observed at ultimate power level, and the beam quality factor ${{\rm M}^2}$ is measured to be less than 1.2. To the best of our knowledge, this is the highest average power for a narrow linewidth single-channel fiber laser system reported so far operating at 1030 nm.

© 2020 Optical Society of America

Near-single-mode 3 kW monolithic fiber oscillator based on a longitudinally spindle-shaped Yb-doped fiber

Lingfa Zeng, Xiaoming Xi, Yun Ye, Hanwei Zhang, Xiaolin Wang, Zhiyong Pan, Zefeng Wang, and Xiaojun Xu
Opt. Lett. 45(20) 5792-5795 (2020)

3.7 kW monolithic narrow linewidth single mode fiber laser through simultaneously suppressing nonlinear effects and mode instability

H. Lin, R. Tao, C. Li, B. Wang, C. Guo, Q. Shu, P. Zhao, L. Xu, J. Wang, F. Jing, and Q. Chu
Opt. Express 27(7) 9716-9724 (2019)

4.6 kW linearly polarized and narrow-linewidth monolithic fiber amplifier based on a fiber oscillator laser seed

Shibiao Liao, Tao Luo, Runheng Xiao, Chang Shu, Junjie Cheng, Zhilun Zhang, Yingbin Xing, Haiqing Li, Nengli Dai, and Jinyan Li
Opt. Lett. 48(24) 6533-6536 (2023)

3.5 kW narrow-linewidth monolithic fiber amplifier at 1064 nm by employing a confined doping fiber

Zhimeng Huang, Qiang Shu, Yun Luo, Rumao Tao, Xi Feng, Yu Liu, Honghuan Lin, Jianjun Wang, and Feng Jing
J. Opt. Soc. Am. B 38(10) 2945-2952 (2021)

2 kW narrow-linewidth Yb-Raman fiber amplifier

Jiaxin Song, Pengfei Ma, Shuai Ren, Song Zhang, Wei Liu, Hu Xiao, Hanwei Zhang, and Pu Zhou
Opt. Lett. 46(10) 2404-2407 (2021)