Modelling and experimental study on surface texturing of single crystalline diamond by infrared nanosecond pulsed laser

In this study, a prediction model of the surface texture of a single crystalline diamond ablated by infrared pulsed laser was established. Firstly, the laser ablation threshold of diamond was obtained through an experiment, and the energy accumulation effect of pulsed laser processing was analysed and simulated. By analysing the time distribution function and defocusing variation function of pulsed laser and by considering the height gradient change of laser energy density caused by the ablation curved surface, the surface morphology change function of diamond pulsed laser ablation was obtained, and the numerical simulation results of the surface texture of linear groove array, square groove array, rhombus groove array, wave groove array and circular groove array were realised. Results showed the groove depth and width, and the average relative error of the two were 12 % and 11.8 %, respectively, which were obtained by comparing the diamond ablation groove experiment with the simulation results. These results indicate that the numerical simulation can achieve a good prediction of the ablation groove profile and realise the surface texture processing with regular groove edges and consistent cross-section profiles.