大气中激光烧蚀铝靶冲量耦合系数实验研究

研究了激光与铝靶相互作用过程中,大气中激光功率密度与铝靶获得的冲量耦合系数的关系,通过改变激光聚焦在靶面上的光斑大小,得到冲量耦合系数与激光功率密度的关系。实验结果表明,当入射激光功率密度为3.47×106W/cm2时,铝靶获得的冲量耦合系数最高。该入射激光功率密度最佳值与理论计算值6.14×106W/cm2符合得较好。用激光支持爆轰波(LSDW)与固体靶相互作用的二维模型理论计算得到的冲量耦合系数与实验结果比较,二者趋势相同,定量比较有较大差别,原因是所用激光光斑面积偏大,不能按照该理论的点爆炸模型来计算。

Impulse Coupling Coefficient in Laser Ablating Aluminium at Air Ambient

To study the effect of laser flux on impulse coupling coefficient during laser aluminium target interaction at air ambient, by changing laser spot size on the target, the relationship between coupling coefficient and laser flux is achieved. The experimental results indicate that the coupling coefficient reaches to maximum when laser flux is 3.47×106 W/cm2, which agrees well with the theoretical result of 6.14×106 W/cm2. The two-dimensional model theory of laser supported detonation wave (LSDW) interacting with solid target is used to calculate the coupling coefficient. And the trends of theory and experiment are the same, but the two have prominent difference in values. The reason is that the laser spot is a little over large and the point blast model is not suitable to calculate the theory values.