高温合金不同脉宽超快激光作用下多脉冲去除阈值  

Multi-pulses ablation threshold of Ni-based superalloy irradiated by ultrafast laser with different pulse duration

作　　者：高云 杨泽南 宋成伟[3] 张远航[3] 张健[3] 张清华[3] 刘民才[3] 李亚国[1] Gao Yun;Yang Zenan;Song Chengwei;Zhang Yuanhang;Zhang Jian;Zhang Qinghua;Liu Mincai;Li Yaguo(Fine Optical Engineering Research Center,Chengdu 610041,China;Science and Technology on Advanced High Temperature Structural Materials Laboratory,Beijing Institute of Aeronautical Materials,Bejing 100095,China;Laser Fusion Research Center,CAEP,Mianyang 621900,China)

机构地区：[1]成都精密光学工程研究中心,成都610041 [2]中国航发北京航空材料研究院先进高温结构材料重点实验室,北京100095 [3]中国工程物理研究院激光聚变研究中心,四川绵阳621900

出　　处：《强激光与粒子束》2022年第4期28-34,共7页High Power Laser and Particle Beams

基　　金：中国工程物理研究院创新发展基金项目(CX2019025);中国工程物理研究院激光聚变研究中心青年人才基金项目(LFRC-PD012)。

摘　　要：实验研究了激光脉冲宽度和脉冲个数对镍基高温合金材料去除阈值的影响,分别在290 fs, 1 ps和7 ps脉宽的激光下,使用1,10,50,100,300,500和1000个不同能量的激光脉冲辐照高温合金样品表面。实验结果表明,烧蚀坑尺寸会随脉冲数的增加而增加,而脉冲宽度的增加会加大脉冲个数对烧蚀坑直径的影响。通过烧蚀坑直径的平方值与激光脉冲能量之间存在的对数关系,得到了不同脉冲宽度下镍基高温合金的多脉冲材料阈值。3种不同脉宽下的高温合金多脉冲去除阈值都存在显著的累积效应。根据去除阈值计算得到290 fs,1 ps和7 ps脉宽下的累积效应系数分别为0.88,0.86和0.78。The effects of the laser pulse duration and the number of pulses on the ablation threshold of Ni-based superalloy were experimentally investigated. In this experiment, Ni-based superalloy samples were irradiated by 1, 10,50, 100, 300, 500 and 1000 laser pulses with different pulse duration, respectively, and pulse duration 290 fs, 1 ps and7 ps were explored. The diameter of ablation holes expands with the increase of laser pulse and the effect of pulse number on the diameter of ablation holes increases with the pulse duration from the experiments. By analyzing the relationship between the diameter of ablation holes and laser pulse energy, multi-pulse ablation threshold of Ni-based superalloy irradiated by ultrafast laser with different pulse duration can be obtained. No matter what the pulse duration of the laser was, the incubation effects of multi-pulse irradiation on the surface of the superalloy were significant. And the incubation coefficient for the thresholds calculated by diameter respectively in 290 fs, 1 ps, and 7 ps is fitted to be0.88, 0.86 and 0.78.

关 键 词：超快激光 高温合金 多脉冲烧蚀 去除阈值 累积效应 

分 类 号：V261.8[航空宇航科学与技术—航空宇航制造工程]