A fundamental study of the interaction between ultrashot laser and stainless steel will be useful in understanding the ablation characteristics and optimizing the ablation performance. A two dimensional finite element model consisting of two temperature equations, phase explosion mechanism and deformed geometry module was developed to simulate picosecond laser ablation of stainless steel. Single- and multi-pulse ablations with various laser fluences were simulated using the developed model. Thereafter, ablation experiments on stainless steel with the corresponding laser fluences and pulse numbers were conducted using a picosecond laser. It was found that the ablation depth and diameter increased with the increasing laser fluence under single-pulse irradiation. For multi-pulse ablation, the depth increased almost linearly with the increasing pulse number, whereas the ablation diameter changed a little. The predicted data overestimated the experimental ablation depths especially at high pulse number, but with the similar trend.

对超强激光与不锈钢之间相互作用的基础研究将有助于理解烧蚀特性并优化烧蚀性能。建立了由两个温度方程，相爆炸机理和变形几何模块组成的二维有限元模型，以模拟皮秒激光对不锈钢的烧蚀。使用开发的模型模拟了具有各种激光注量的单脉冲和多脉冲消融。此后，使用皮秒激光在不锈钢上进行了相应的激光通量和脉冲数的烧蚀实验。发现在单脉冲照射下，烧蚀深度和直径随着激光能量密度的增加而增加。对于多脉冲消融，深度随着脉冲数的增加而几乎呈线性增加，而消融直径变化不大。预测数据高估了实验消融深度，特别是在高脉冲数时，但趋势相似。