通过同时抑制受激布里渊散射和自脉冲效应,实现了具有窄线宽和近衍射极限光束质量的高功率、线偏振全光纤放大器,其最高输出激光功率为2.62 kW,光光效率达到了86.7%,光束质量M2、偏振消光比及光谱线宽在放大过程中基本保持不变,M2小于1.3,偏振消光比约为96.3%,3 dB线宽为32 GHz,20 dB二阶矩线宽为30 GHz。2.62 kW是目前报道的窄线宽线偏振全光纤结构激光器能达到的最高输出功率。

We demonstrate a high-power, linearly polarized all-fiber amplifier with a narrow linewidth and near-diffraction-limit beam quality by suppressing the stimulated Brillouin scattering and self-pulsing effects simultaneously. The maximum laser power is 2.62 kW with 86.7% optical-optical efficiency. Beam quality (M²), polarization extinction ratio (PER), and linewidth are well maintained during power amplification with M²<1.3, PER ~96.3%, a 3 dB linewidth of 32 GHz, and a 20 dB second-order moment linewidth of 30 GHz. To the best of our knowledge, this is the largest demonstration of an all-fiber laser with narrow linewidth, linear polarization, and beam quality near the diffraction limit.