连续激光与复合激光辐照钢靶的相变烧蚀分析  

Analysis of Phase Change and Ablation of Steel Targets Irradiated by Continuous Laser and Composite Laser

作　　者：王铭 韩越 车东博 王挺峰[1] Wang Ming;Han Yue;Che Dongbo;Wang Tingfeng(Changchun Institute of Optics,Fine Mechanics and Physics,Chinese Academy of Sciences,Changchun 130033,Jilin,China;University of Chinese Academy of Sciences,Beijing 100039,China)

机构地区：[1]中国科学院长春光学精密机械与物理研究所,吉林长春130033 [2]中国科学院大学,北京100039

出　　处：《激光与光电子学进展》2022年第11期298-305,共8页Laser & Optoelectronics Progress

基　　金：中科院前沿科学重点研究项目(QYZDVSSWSLH014)。

摘　　要：针对千瓦级的连续激光和连续/调制脉冲复合激光辐照SUS304不锈钢靶,建立了烧蚀与相变的仿真模型,计算了钢靶在复合激光和连续激光辐照下的温升曲线以及相变分布,并进行了实验验证。采用动网格方法描述了钢靶的烧蚀过程,得到了钢靶的烧蚀与相变深度随时间的变化曲线。将上述仿真结果与实验结果进行对比,二者在温升、相变分布与烧蚀方面吻合较好。根据仿真和实验结果可知,钢靶在上述激光辐照下发生穿孔的方式按能量密度的高低分为汽化穿孔和熔融穿孔两种方式。在输出功率相同的情况下,对厚度为20 mm的钢靶进行辐照,相比于3.4 kW连续激光辐照,2.55 kW/0.85 kW复合激光辐照下的烧穿时间缩短41%;在烧蚀过程中,质量迁移方式为熔融和汽化冲压,且有明显的熔融物喷溅现象,这对激光辐照下的钢靶温升和相变烧蚀过程形成了一定程度的正反馈。In this paper,the simulation model of ablation and phase change of SUS304 stainless steel targets irradiated by continuous laser or continuous/modulated composite laser is established.The temperature rise curve and phase change distribution of the steel target irradiated by the composite laser or the continuous laser are calculated and verified by experiments.The ablation process of steel target is described by the dynamic grid method,and the curves of the ablation and phase change depths versus time are obtained.The simulation results are compared with the experimental results,and the results of temperature rise,phase transition distribution and ablation are in well agreement.According to the simulation and experimental results,the perforation of the steel target under the above laser irradiation can be divided into two ways:vaporization perforation and melting perforation according to the power density.When the output power is the same,the speed under the 2.55 kW/0.85 kW composite laser is 41%faster than that under the 3.4 kW continuous laser for the 20 mm steel target.The mass transfer mode is the joint action of melting and vaporization stamping,and the molten material splashing phenomenon is obvious in the ablation process,which forms a certain degree of positive feedback to the temperature rise and the phase change and ablation process of the steel target.

关 键 词：激光光学 激光辐照 钢靶 相变 烧蚀 数值仿真 

分 类 号：TK124[动力工程及工程热物理—工程热物理] O434.3[动力工程及工程热物理—热能工程]