激光辐照下金属靶表面汽化现象研究
INVESTIGATION OF VAPORIZATION ON METALLIC TARGETS IRRADIATED BY PULSE LASER BEAMS
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摘要: 用高速纹影诊断技术研究激光辐照下金属表面发生汽化的特征及蒸气发展运动过程,结合汽化模型给出了凝聚相表面温度与激光入射功率密度的关系。由实验得到了不同入射激光功率密度下汽化表面(凝聚相)温度,蒸气羽阵面速度,前驱空气冲击波速度。Abstract: The vaporizalon characteristic and the vapor cval ution process of metallic targets irradiated by pulse laser beams were investigated by high speed schlieren diagonstic technique in this paper.The temperature of condensed phase transition, the front velocity of vapor plume and velocity of precursor shock wave in air of LYI2 aluminum targets were measured experimentally with different incident laser flux, and the temperature on the surface of condensed phase transition as a function of incident laser flux was obtained by approximatically analysis vaporization model.
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