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使用重复频率为400 Hz的Nd∶YAG单纵模主振荡器功率放大(MOPA)激光器作为光源,大口径锥度光纤作为受激布里渊散射(SBS)种子池产生SBS种子光,固体熔石英棒作为SBS放大池,对反向注入的SBS种子光在熔石英棒中呈现不同增益,也即不同抽运功率条件下的布里渊放大行为从功率、时间和空间三个大的方面进行了详细的实验研究,包括放大的SBS输出功率、注入SBS种子光放大倍率、总的SBS反射率、熔石英棒布里渊放大器提取效率以及脉冲宽度和光束质量随SBS种子注入功率的变化情况等。获得了最高输出15.5 W的放大SBS输出、70倍的SBS种子光放大倍率、大于50%的总反射率以及52%的能量提取效率;观察到脉冲展宽以及布里渊放大器中的增益导引两种现象。实验结果表明,在小信号SBS种子光和大信号SBS种子光注入情况下,熔石英棒布里渊放大器具有不同的放大特性。另外,在实验过程中还发现,SBS种子光和抽运光的空间重合程度以及熔石英棒中抽运功率密度的大小是影响SBS放大输出功率的两个重要方面。
Using a Nd: YAG single longitudinal mode main oscillator power amplifier (MOPA) laser with a repetition frequency of 400 Hz as a light source, a large bore taper fiber as SBS seed cell generates SBS seed light, a solid fused silica rod As the SBS amplification pool, the SBS seed light injected in the opposite direction presents different gains in the fused silica rod. That is, the behavior of the Brillouin amplification under different pumping powers is described in detail from the three aspects of power, time and space Including the amplified SBS output power, injected SBS seed light magnification, the total SBS reflectance, the extraction efficiency of the fused silica rod Brillouin amplifier, and the variation of pulse width and beam quality with the SBS seed injection power. Amplified SBS output with a maximum output of 15.5 W, SBS seed optical magnification of 70x, total reflectance of more than 50%, and energy extraction efficiency of 52% were obtained; pulse broadening and gain guidance in Brillouin amplifier two were observed Kind of phenomenon Experimental results show that the fused-silica rod-Brillouin amplifier has different amplification characteristics under the conditions of small-signal SBS seed light and large-signal SBS seed light. In addition, it was also found during the experiment that the spatial coincidence of SBS seed light and pumping light and the power density of pumped fused silica rods are two important aspects that affect the output power of SBS amplification.