应用熔石英棒相位共轭镜的LD泵浦激光MOPA系统

LD pumped laser MOPA system with a phase conjugating mirror of a fused silicon rod

用熔石英棒作为相位共轭镜材料,在LD泵浦的激光MOPA系统中实现了在100和400 Hz下的受激布里渊散射相位共轭。实验测得重复频率100 Hz时双通放大后的x和y方向的光束质量平方因子分别为1.74和1.66,最大反射率达到24.33%,脉冲宽度从60 ns压缩到31.34 ns。重复频率400 Hz时双通放大后的x和y方向的光束质量平方因子分别为2.10和2.12,脉冲宽度从56.69 ns压缩到28.84 ns。

Fused silica is used as the material of the phase conjugated mirror. In the LD pumped laser MOPA system, phase conjugation through the stimulated Brillouin scattering is realized at the repetition frequency of 100 Hz and 400 Hz. At the repetition frequency of 100 Hz, the beam quality factor reached 1.74 in x direction and 1.66 in y direction after double-pass amplification. The highest reflectivity is 24.33% with the input energy of 60.1 mJ, the pulse duration is compressed from 60 ns to 31.34 ns. At the repetition frequency of 400 Hz, the beam quality factor reached 2.10 in x direction and 2.12 in y direction after doublepass amplification. The pulse duration is compressed from 56.69 ns to 28.84 ns.