使用最高重复频率可达1000 Hz的脉冲激光二极管抽运的电光调Q单纵模激光器作为种子源,经过两级预放大器和两级主功率放大器后获得高重复频率高能量的激光输出。然后使用此光源对由芯径为1 mm和400 μm的石英光纤组合而成的大口径锥度光纤固体相位共轭镜在重复频率分别为1000,500和400 Hz情况下的受激布里渊散射反射率进行了详细的实验研究,并分别得到33.3%,41.2%和50.7%的最高反射率。实现了固体相位共轭镜在高重复频率大能量条件下大于50%的受激布里渊散射反射率。在重复频率为400 Hz时,激光脉冲宽度从24 ns压缩到6 ns,压缩比为4:1,且脉冲光滑无调制。

High repetition rate and high energy laser is realized by two-stage pre-amplifiers and two-stage main amplifiers seeded by a pulsed diodes pumped EO Q-switched single-longitudinal-mode laser with pulse repetition rate up to 1000 Hz.Detailed experimental investigation on stimulated Brillouin scattering reflectivity of a large aperture fused silica fiber is carried out using this laser source.Reflectivities of 33.3%,41.2% and 50.7% are achieved at the repetition rate of 1000,500 and 400 Hz respectively.The tapered fiber′s core diameters are 1 mm and 400 μm for its two end surfaces.More than 50% stimulated Brillouin scattering reflectivity with such high repetition rate and high energy is realized.At the repetition rate of 400 Hz,the pulse duration is compressed to 6 ns from 24 ns,with a compression ratio of 4:1.The pulse shape is free of modulation.