Effects of surface scratches on thermal damage characteristics of SiO2

Explore the effect of surface scratches on material properties, Two analytical models for thermal damage were established. The modulated light field generated by scratches at different relative positions was calculated. By analyzing the distribution of surface temperatures, we delve into the thermal damage thresholds of SiO2. Results show that, for parallel scratches, the thermal damage threshold will vary with the interval of the scratches, the damage threshold also affected by the depth-width ratio of the scratch. For cross-scratches defects, both the cross angle and depth-width ratio have effects on the thermal damage threshold. And for the two kinds scratches the depth-width ratio is easier to make the material damaged.