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采用2套基于光偏转原理的光纤传感器(OBD),测量了激光空泡脉动全过程及空泡溃灭对靶材造成的破坏。通过实验获得了激光空泡在靶表面2次膨胀收缩的全过程,判定了空泡在2次脉动中对应的最大、最小泡半径和溃灭周期,并推算了空泡泡壁速度随时间的变化关系。实验发现,在脉冲激光作用下,水中靶材依次受到激光烧蚀压力和射流冲击力作用,且射流冲击力是造成靶材破坏的主要原因。
Two sets of optical fiber sensor (OBD) based on the principle of optical deflection were used to measure the whole process of laser bubble pulsation and the destruction of the target caused by void collapse. The whole process of secondary expansion and contraction of laser cavitation on the target surface was obtained through experiments. The maximum and minimum bubble radius and collapse period of cavitations in two pulsations were determined. The bubble wall velocity with time alternative relation. Experiments show that under the action of pulsed laser, the targets in water are affected by laser ablation pressure and jet impulse in turn, and the jet impact force is the main reason for the target destruction.