光学学报, 2016, 36 (9): 0914001, 网络出版: 2016-09-09
材料表面缺陷对激光热损伤的影响
Laser-Induced Thermal Damage Influenced by Surface Defects of Materials
摘要
建立了激光辐照下光学表面典型锥状缺陷的热损伤分析模型,基于有限差分方法计算了典型缺陷附近的调制光场和温度场分布,得出了缺陷对材料热损伤阈值的影响规律。结果表明,热损伤阈值与入射激光的波长呈正相关,与缺陷的尺寸呈负相关。同一波长激光辐照的情况下,材料表面有1个缺陷存在时,热损伤首先发生在缺陷处,而当多个缺陷存在时,热损伤首先发生在2个缺陷的中间区域,并且多个缺陷要比单个缺陷更易造成损伤;对于不同波长的辐照激光来说,波长为800 nm的激光要比波长为1064 nm的激光更容易使材料产生损伤。
Abstract
The thermal damage analysis model of a classical circular cone protuberance on the surface induced by laser is set up. The modulation light field distribution and the temperature field distribution around the defects are calculated by finite-difference method, and the influence rule of the defects on thermal damage threshold is obtained. Results show that the thermal damage threshold increases while incident wavelength of laser increases and the size of defects decreases. In conditions of the same wavelengths, thermal damage occurs first in the defect when there is a defect, while thermal damage occurs in the middle region of the two defects first and it is more likely to make damage when there are multiple defects. For different wavelengths, the laser wavelength of 800 nm is more likely to cause damage in the material than the laser with wavelength of 1064 nm.
张龙霞, 朱晓冰, 李风雨, 张蓉竹. 材料表面缺陷对激光热损伤的影响[J]. 光学学报, 2016, 36(9): 0914001. Zhang Longxia, Zhu Xiaobing, Li Fengyu, Zhang Rongzhu. Laser-Induced Thermal Damage Influenced by Surface Defects of Materials[J]. Acta Optica Sinica, 2016, 36(9): 0914001.