氟化氢激光烧蚀铝靶冲量耦合系数实验

Experiment on impulse coupling coefficient in hydrogen fluoride laser ablating aluminum

为了研究激光功率密度对氟化氢激光与铝靶相互作用过程中冲量耦合系数的影响,分别在大气和真空中,用聚焦后的激光烧蚀铝靶,通过改变聚焦到铝靶的光斑大小,得到冲量耦合系数和激光功率密度的关系,并将该实验结果与CO2激光和铝靶相互作用的实验结果进行比较。结果表明,氟化氢激光与铝靶相互作用得到的冲量耦合系数和激光功率密度的关系与CO2激光不同。大气和真空中,氟化氢激光与铝靶相互作用开始出现冲量传递的阈值分别约为8.03×106W/cm2和7.69×106W/cm2,并且这两种情况下,氟化氢激光器与铝靶相互作用得到的最大冲量耦合系数均高于CO2激光。

To study the effect of laser flux on impulse coupling coefficient during the interaction between hydrogen fluoride laser and aluminum at air ambient and in vacuum, respectively, by changing laser spot size on the aluminum target, the relationship between impulse coupling coefficient and laser flux is obtained, which are compared with the interaction between CO2 laser and aluminum. The results indicate that relationship between hydrogen fluoride laser and aluminum is different from that between CO2 laser and aluminum. The threshold of impulse transfer between hydrogen fluoride laser and aluminum is 8.03 ×10^6W/cm^2 and 7.69 ×10^6W/cm^2 at air ambient and in vacuum, respectively. And both in the two conditions, the highest impulse coupling coefficient in the interaction between hydrogen fluoride laser and aluminum is greater than that between CO2 laser and aluminum.