Observation and characterization of quasi-continuous wave kW-class laser interaction with metal and metal oxide targets using a high-speed camera and microscopes
Observation and characterization of quasi-continuous wave kW-class laser interaction with metal and metal oxide targets using a high-speed camera and microscopes
复制标题
DOI：
10.1088/1402-4896/acbba9
复制
发表时间：
2023-02
期刊：
影响因子：
2.9
通讯作者：
H. Daido;Tomonori Yamada;K. Saruta;M. Miyabe;Chikara Ito;Takuya Shibata;Kaoru Inoue;R. Terabayashi;S. Hasegawa
中科院分区：
文献类型：
--
作者：
H. Daido;Tomonori Yamada;K. Saruta;M. Miyabe;Chikara Ito;Takuya Shibata;Kaoru Inoue;R. Terabayashi;S. Hasegawa
表征千瓦级准连续波（脉冲持续时间为10毫秒）激光与金属靶和那些与金属氧化物靶相互作用的激光诱导击穿和连续的激光诱导熔化和蒸发耦合的机械响应，然后喷射的各种颗粒和碎片。使用0.3-5 kW光纤激光器与高速相机耦合进行实验，以观察相互作用的动力学。分别用级联撞击器和自制的收集器收集喷射出的几μm直径的细颗粒，并用电子显微镜观察。用数字光学显微镜观察辐照标记的变化。我们还测量了从一个目标喷射出的总质量。实验结果表明：第一，金属靶与激光相互作用的阈值强度比金属氧化物靶低且稳定;其次，在不锈钢靶中，由来自激光加热的薄层的热传导产生的熔融层的动力学和相邻固体层的具有较少机械响应的连续颗粒喷射是主导过程，而在金属氧化物靶中，在相对较深的相互作用区域中的断裂与具有相对较大的激光射距波动的脆性材料响应相结合，除了激光诱导熔化之外，还有重要作用。
Characterization of kW class quasi-continuous wave (a pulse duration of 10 ms) laser interaction with metal targets and those with metal oxide targets are presented in respect to the laser induced breakdown and the successive laser induced melting and evaporation coupled with a mechanical response followed by ejection of various kinds of particles and fragments. An experiment was performed using 0.3–5 kW fiber lasers coupled with a high-speed camera to observe dynamics of the interaction. Ejected fine particles with a few μm diameters were collected using a cascade impactor and a home-made collector, respectively and these were observed with electron microscopes. Shapes of irradiation marks were observed with a digital optical microscope. We also measured total ejected mass from a target. The experimental results reveal that firstly the laser threshold intensity of the interaction with the metal target was lower and more stable than those with the metal oxide targets. Secondly, in the stainless steel targets, the dynamics of molten layer created by thermal conduction from the laser heated thin layer and successive particle ejection with less mechanical response by the adjacent solid layer are dominant processes, while in the metal oxide targets, the fracturing in the relatively deeper interaction region coupled with brittle material response having relatively large laser shot to shot fluctuation appears to play a significant role in addition to the laser induced melting.