Effect of residual polishing particles on thermal damage characteristics of materials in surface scratches
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摘要: 建立了高功率激光辐照下光学表面存在划痕且残存抛光颗粒时的热损伤分析模型，对这种复杂缺陷条件下的光学材料热损伤性能进行了研究。利用有限差分法计算了不同尺度抛光颗粒处于划痕中不同位置时光学材料表面的光场调制和温度场的分布。根据表面温度分布，得到了对应条件下光学材料的热损伤阈值变化规律。结果表明：除了抛光颗粒半径对材料损伤阈值存在影响外，当抛光颗粒位于划痕宽度方向不同位置时，材料的热损伤阈值也会有比较明显的变化；当位于划痕中心时，抛光颗粒对材料光场调制最强，更容易造成材料的熔化损伤。Abstract: A thermal damage analysis model of scratches and residual polishing particles on the optical surface is established. The thermal damage properties of optical materials under such complex defects are studied. The finite difference method was used to calculate the light field modulation and temperature field distribution of the optical material surface at different positions of the polished particles at different scales. According to the surface temperature distribution, the thermal damage threshold of the optical material under the corresponding conditions is achieved. The results show that in addition to the influence of the polishing particle radius on the material damage threshold, when the polishing particles are located at different positions in the scratch width direction, the thermal damage threshold of the material will also change significantly. Among them, the polishing particles in the center of the scratch have the strongest modulation on the light field, and are more likely to cause melting damage of the material.
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Key words:
- polished particles /
- FDTD /
- thermal damage threshold /
- light field modulation
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图 1 同时存在划痕与抛光颗粒分析模型示意图
Figure 1. Schematic diagram of the analysis model of scratches and polished particle
图 2 抛光颗粒在划痕宽度方向上不同位置对材料表面光场分布的影响
Figure 2. Effect of polishing particles on the light field distribution of the material surface at different positions in the width direction of the scratch
图 3 划痕宽度不同位置处抛光颗粒对光场调制(a)及热损伤阈值(b)的影响
Figure 3. Effect of polishing particles on the light field modulation (a) and thermal damage threshold (b) at different locations of the scratch width
图 4 划痕长度不同位置处抛光颗粒对光场调制(a)及热损伤阈值(b)的影响
Figure 4. Effect of polishing particles on the light field modulation (a) and thermal damage threshold (b) at different locations of the scratch length
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