调Q激光作用水中靶材表面引起的力学效应分析

在分析强激光作用下水中靶材产生的力学效应和力学特性基础上,用基于光偏转原理制做的光纤力学传感器测量了不同激光能量的水下靶材表面的瞬态压力,得到了调Q-Nd：YAG激光等离子体冲击波和空泡射流的压力信号,并从耦合动量角度进行比较,计算出等离子体烧蚀力的冲量和射流的冲量.结果表明,空泡射流的力学效应与等离子体冲击波的一样重要,有时甚至更明显.

Analyses of the Mechanical Effect on the Target in Water Induced by a Q-switched Laser

The mechanical effect and its characteristic produced by a high-power laser irradiated upon a solid target in water have been analyzed. An optical fiber pressure sensor basing on light beam deflection has been used to measure the pressure on the surface of the target,and the instantaneous pressure signals of laser plasma shock wave and bubble jetting have been gotten at different laser energy values. A compare has been made between the laser plasma shock wave and bubble jets after their coupling impulses have been calculated. The results have indicated that the bubble jetting is as important as the laser plasma shock wave,and more important sometimes.