2026/04/02 by Zitao Li, Shubo Cheng, Mengsi Liu +5 · 1 citation
Engineering · #Laser Material Processing Techniques #Advanced Surface Polishing Techniques #Welding Techniques and Residual Stresses
paper · doi:10.1142/s0217984926501253
Although fused silica shows no visible optical damage when irradiated below its LIDT, internal defect proliferation can still increase absorption and degrade its optical properties. Under microsecond pulse laser irradiation, the evolution of temperature and thermal stress is critical in determining material damage. This study examines how multi-pulse laser exposure alters the coupled evolution of temperature and thermal stress in fused silica. A point-defect evolution model is developed and integrated with numerical simulations to explore the coupling effects of temperature and stress. The study first examines the temperature rise under multi-pulse laser irradiation and then analyzes the resulting thermal stress, including its spatial distribution and its dependence on pit depth, laser power, and spot radius. The temperature rise under multi-pulse laser irradiation was first analyzed, followed by an investigation of the resulting thermal stress distribution and its variation with pit depth, laser power, and spot radius. After identifying optimal laser parameters, the effects of laser power and radius on the maximum temperature and stress in fused silica are explored. Results show that both laser power and radius significantly influence the temperature and stress distributions, with temperature playing a dominant role in thermal stress evolution. This study provides a theoretical foundation for understanding fatigue damage risk in fused silica under multi-pulse laser exposure and offers new insights into the annealing treatment of point defects in the material.