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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800nm的激光要比波长为1064nm的激光更容易使材料产生损伤。
The thermal damage analysis model of the typical conical defects on the optical surface under laser irradiation was established. The distributions of the modulated light field and the temperature field near the typical defects were calculated based on the finite difference method. The influence rules of the thermal damage threshold on the material were obtained. The results show that the thermal damage threshold is positively correlated with the incident laser wavelength and negatively correlated with the defect size. The same wavelength laser irradiation, the material surface has a defect exists, the thermal damage occurs first in the defect, and when multiple defects exist, the thermal damage first occurred in the middle of the two defects, and multiple defects Which is more likely to cause damage than a single defect. For a laser with different wavelengths, a laser with a wavelength of 800 nm is more likely to damage the material than a laser with a wavelength of 1064 nm.