基于简单MOPA结构实现3.08 kW全光纤窄线宽线偏振激光输出

Output of 3.08 kW narrow linewidth linearly polarized all-fiber laser based on a simple MOPA structure

摘要: 基于简单的主振荡功率放大结构，演示了一种高功率窄线宽线性偏振全光纤激光器，其最大输出功率为3.08 kW，3 dB线宽为0.2 nm。在整个功率缩放过程中，偏振消光比约为94%，光束质量M ²约为1.4。这是国内外首次实现3 kW全保偏光纤激光输出，与基于相位调制的窄线宽激光器相比，该激光器可实现近似的线宽，同时具有受激布里渊散射阈值高、系统结构简单、成本低等特点。

Abstract: We demonstrated a narrow linewidth linearly polarized all-fiber laser operating at maximum output power of 3.08 kW with a 3 dB linewidth of 0.2 nm based on a simple master oscillator power amplifier (MOPA) structure. The polarization extinction ratio (PER) is about 94% and the M ² is about 1.4 along the whole power scaling process. This is the first demonstration of a 3 kW linearly polarized all-fiber laser output. Compared with the narrow linewidth fiber amplifier based on phase modulation, this system can achieve a nearly same linewidth. Meanwhile, it has the characteristics of high stimulated Brillouin scattering (SBS) threshold, simple structure, and low cost, etc.