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报道了一种由纤芯直径分别为15μm和25μm的大模场光纤组成的全光纤脉冲放大器模块。当注入脉冲宽度为10 ns,重复频率为1 Hz,光谱宽度为0.3 nm,脉冲能量为80 nJ的激光脉冲时,经过两级放大输出的激光脉冲峰值功率为30 kW,单脉冲能量为300μJ。此外,实验研究了该放大器模块输出的时间特性。研究发现:由于受激布里渊散射(SBS)效应,限制了单纵模光纤激光在光纤中的高能量放大,采用宽带激光脉冲可以有效地抑制SBS效应,提高光纤放大器的SBS阈值。
A full-fiber pulsed amplifier module consisting of large mode field fibers with core diameters of 15 μm and 25 μm, respectively, is reported. When the pulse width is 10 ns, the repetition frequency is 1 Hz, the spectral width is 0.3 nm and the pulse energy is 80 nJ, the peak power of the laser pulse output through two stages of amplification is 30 kW, and the single pulse energy is 300 μJ. In addition, the experimental study of the amplifier module output time characteristics. It is found that the SBS effect of the stimulated Brillouin scattering (SBS) can limit the high energy amplification of a single longitudinal mode fiber laser in the fiber, and the SBS effect of the fiber amplifier can be effectively suppressed by using a broadband laser pulse and the SBS threshold of the fiber amplifier can be increased.