Theoretical modeling and simulation of irradiation effects of non-ideal Gaussian beams on metal materials in linearly polarized mode

This paper investigates the modeling of irradiation effects of non-ideal Gaussian Linearly Polarized mode lasers on metallic materials and proposes corresponding theoretical models and numerical simulation methods. Based on theories of diffraction transmission, heat transfer, and fluid dynamics, this study comprehensively considers the fundamental mode ratio, aberrations, and atmospheric transmission effects to characterize the target light intensity distribution of non-ideal Gaussian beams under two irradiation scenarios: point laser and line laser. A theoretical model for non-ideal Gaussian laser irradiation on metallic materials is established. Using SUS304 stainless steel as the target material, simulations and experiments for both point and line irradiations were conducted, validating the accuracy of the simulation model in terms of temperature-rise and ablation effects. The model quantitatively analyzes the influence of the laser irradiation duty cycle and the beam quality factor M2 on irradiation effects. This research provides a flexible and reliable multi-physics model for non-ideal Gaussian laser irradiation on metallic materials, offering valuable insights for modeling and simulating laser irradiation effects.