Research on Laser Ablation Technology in the Material Interaction of Two-dimensional Axisymmetric Ablation Model

Abstract

In order to explore the mechanism of interaction between nanosecond pulsed intense laser and material, the paper established a two-dimensional numerical model, using finite difference method to numerically simulate the temperature field of nanosecond laser pulse ablation of metal aluminium. By comparing different pulse widths, the temperature field caused by the laser under the spot and energy evolves with time. It is found that the temperature in the early stage of the pulse rises faster than in the later stage. The isotherm diagram shows that the centre temperature rises fastest, the ablation profile is similar to the shape of the laser beam, and the ablation depth reaches 1 -5μm. The longer the pulse width, the narrower and deeper the ablation, the larger the spot, the wider and the shallower the ablation. The calculation results show that, compared to the uniform distribution, when the laser has a Gaussian distribution, the target aluminium centre can be obtained the higher the temperature rise, the more prone to ablation and the shorter the melting time of aluminium. The model established in this paper can be easily extended to three-dimensional situations.