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实验研究了光纤传输调QNd:YAG高功率脉冲激光特性,包括光纤的传输效率、输出光束特性、输出光斑能量分布以及激光诱导损伤特性。得出的主要结论为:光纤传输高峰值功率激光引起受激拉曼散射(SRS)和受激布里渊散射(SBS)的产生是导致传输效率下降的主要原因;光纤输出光束束腰位置为输出端面,发散角略大于入射角,光束质量下降,输出光束截面光斑能量分布“匀化”;光纤的端面激光损伤限制了传输激光功率的提高,其主要损伤相貌分为—坑状损伤、熔融损伤和溅射损伤,实验得出光纤端面的激光零损伤概率阈值功率密度为3.85GW/cm2。
The QNd: YAG high-power pulsed laser characteristics of optical fiber transmission are experimentally studied, including the transmission efficiency of the optical fiber, the characteristics of the output beam, the energy distribution of the output beam and the laser-induced damage characteristics. The main conclusions drawn are as follows: the main reason that the transmission efficiency is decreased due to SRS and SBS generated by fiber-optic high peak power laser is Output end face, the divergence angle is slightly larger than the incident angle, the beam quality declines and the energy distribution of the output beam cross-sectional spot “homogenization ”; the laser end face damage of the optical fiber limits the increase of the transmission laser power. , Melting damage and sputtering damage. Experimental results show that the laser zero damage probability threshold power density of fiber end face is 3.85GW / cm2.