Abstract

We demonstrated a mode-controllable fiber laser system with output power of 1.4 kW level. The system consists of a kilowatt-scale master oscillator power amplifier and an active feedback control system based on the stochastic parallel-gradient descent algorithm. We can convert the LP₀₁ and LP₁₁ modes by performing an extremum search for power in the bucket of the output beam. Under the same pump power, we obtain the mode conversion of LP₁₁ to LP₀₁, and the efficiency is as high as 99.5%. The maximum output power of LP₁₁ and LP₀₁ mode are 1396 W and 1389 W, respectively, with corresponding slope efficiencies of 85.8% and 84.1%.

500 W level MOPA laser with switchable output modes based on active control

Rongtao Su, Baolai Yang, Xiaoming Xi, Pu Zhou, Xiaolin Wang, Yanxing Ma, Xiaojun Xu, and Jinbao Chen
Opt. Express 25(19) 23275-23282 (2017)

Active phase and polarization locking of a 1.4 kW fiber amplifier

Gregory D. Goodno, Stuart J. McNaught, Joshua E. Rothenberg, Timothy S. McComb, Peter A. Thielen, Michael G. Wickham, and Mark E. Weber
Opt. Lett. 35(10) 1542-1544 (2010)

2.4 kW 1045 nm narrow-spectral-width monolithic single-mode CW fiber laser by using an FBG-based MOPA configuration

Yang Xu, Quan Sheng, Peng Wang, Xuelong Cui, Yizhu Zhao, Haixin Xu, Xiangdong Ding, Qiang Fang, Wei Shi, and Jianquan Yao
Appl. Opt. 60(13) 3740-3746 (2021)

Adaptive conversion of a high-order mode beam into a near-diffraction-limited beam

Haichuan Zhao, Xiaolin Wang, Haotong Ma, Pu Zhou, Yanxing Ma, Xiaojun Xu, and Yijun Zhao
Appl. Opt. 50(22) 4389-4392 (2011)

High brightness in-band pumped fiber MOPA with output power scaling to >4.6k W

Busra Mete, Aydın Yeniay, F. Necati Ecevit, and Salih K. Kalyoncu
Appl. Opt. 61(34) 10121-10125 (2022)