High-power mid-infrared femtosecond master oscillator power amplifier Er:ZBLAN fiber laser system
High-power femtosecond mid-infrared (MIR) lasers are of vast importance to both fundamental research and applications. We report a high-power femtosecond master oscillator power amplifier laser system consisting of a single-mode Er:ZBLAN fiber mode-locked oscillator and pre-amplifier followed by a large-mode-area Er:ZBLAN fiber main amplifier. The main amplifier is actively cooled and bidirectionally pumped at 976 nm, generating a slope efficiency of 26.9%. Pulses of 8.12 W, 148 fs at 2.8 μm with a repetition rate of 69.65 MHz are achieved. To the best of our knowledge, this is the highest average power ever achieved from a femtosecond MIR laser source. Such a compact ultrafast laser system is promising for a wide range of applications, such as medical surgery and material processing.
Linpeng Yu, Jinhui Liang, Qinghui Zeng, Jiacheng Wang, Xing Luo, Jinzhang Wang, Peiguang Yan, Fanlong Dong, Xing Liu, Qitao Lü, Chunyu Guo, Shuangchen Ruan. High-power mid-infrared femtosecond master oscillator power amplifier Er:ZBLAN fiber laser system[J]. High Power Laser Science and Engineering, 2023, 11(4): 04000e53.