报道一种高峰值功率、线偏振、窄线宽、纳秒脉冲的全光纤激光器。种子源激光器产生的单频连续激光通过一个电光强度调制器实施调制, 为抑制受激布里渊散射(SBS), 脉宽设置为2.8 ns, 重复频率为1.59 MHz。经两级预放、一级功率放大进行放大, 激光最大平均输出功率为139 W, 峰值功率为31 kW。实验过程中未发现受激拉曼散射(SRS), 功率的提升受限于SBS。在最高功率输出情况下, 激光器的光束质量小于1.3。受限于(6+1)×1保偏合束器, 激光器的偏振消光比为14.5 dB。

A 31 kW narrow-linewidth linearly polarized nanosecond all-fiber laser is proposed. The single-frequency continuous laser generated by the seed-source laser is modulated by an electro-optic intensity modulator. To suppress stimulated Brillouin scattering (SBS), the pulse width is set to 2.8 ns, and the repetition rate is 1.59 MHz. After two levels of pre-amplification, and primary power amplification for amplification, the maximum average output power of laser can reach 139 W while the peak power is 31 kW. As stimulated Raman scattering (SRS) is not found during the experiment , the increase in power is limited by SBS. The laser beam quality is less than 1.3 at the maximum output power. The polarization extinction ratio is 14.5 dB, which is limited by the polarization-maintaining (6+1)×1 fiber combiner.