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采用两套基于光偏转原理的光纤传感器测量了固壁旁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两次膨胀收缩的全过程,判定了空泡在两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。此外,在脉冲激光作用下,水中靶材依次受到激光烧蚀压力和激光空泡在固体壁面附近溃灭时产生的射流冲击力的作用,且射流冲击力是造成靶材破坏的主要原因。
Two sets of optical fiber sensors based on light deflection principle were used to measure the whole process of the cavitation bubble near the solid wall and the destruction of the target caused by the collapse of the cavitation bubble. The whole process of two expansion and contraction of laser cavitation on the target surface was obtained experimentally, and the maximum and minimum bubble radius and collapse period of cavitation bubbles in two pulsations were determined. The bubble wall velocity with time alternative relation. In addition, under the action of pulsed laser, the target in water is affected by the laser ablation pressure and the jet impact force generated when the laser cavity collapses near the solid wall in turn, and the jet impact force is the main reason for the target destruction.