Chu Qiuhui, Zhao Pengfei, Lin Honghuan, Liu Yu, Li Chengyu, Wang Bopeng, Guo Chao, Tang Xuan, Tang Chuanxiang, Jing Feng
Appl Opt. 2018 Apr 20;57(12):2992-2996. doi: 10.1364/AO.57.002992.
kW-level 1030 nm polarization-maintained fiber laser with narrow linewidth and near-diffraction-limited beam quality is demonstrated. Theoretical simulations based on the power balance equation are first performed to optimize the system parameters of the 1030 nm ytterbium-doped fiber laser for the maximum suppression of amplified spontaneous emission (ASE). With the optimized parameters, both the copumped and counterpumped MOPA lasers are implemented to obtain an output power of >1 kW. In both cases, the ASE suppression ratio reaches 40 dB with a 3 dB linewidth of about 0.14 nm, and the polarization extinction ratio is about 12 dB at 1 kW of output power. The beam quality starts degrading at 900 W of output power in the copumped structure, but maintains nearly single mode (Mx2,My2)=(1.07,1.12) until power is over 1 kW in the counterpumped structure.
展示了具有窄线宽和近衍射极限光束质量的千瓦级1030纳米保偏光纤激光器。首先基于功率平衡方程进行理论模拟，以优化1030纳米掺镱光纤激光器的系统参数，以最大程度抑制放大自发辐射（ASE）。采用优化后的参数，实现了同向泵浦和反向泵浦的主振荡功率放大器（MOPA）激光器，以获得大于1千瓦的输出功率。在这两种情况下，ASE抑制比达到40分贝，3分贝线宽约为0.14纳米，在1千瓦输出功率下偏振消光比约为12分贝。在同向泵浦结构中，输出功率为900瓦时光束质量开始下降，但在反向泵浦结构中，直到功率超过1千瓦，光束质量仍保持近单模（Mx2，My2）=（1.07，1.12）。
