Ablation Threshold Measurement and Chemical Modification of UV Nanosecond Laser Micromachining of Polycrystalline Diamond

In recent years, the influence of pulsed laser interaction with material has become a research hotspot. The micromachining of polycrystalline diamond with pulsed laser is a very important research direction. This study scrutinized the ablation threshold and chemical modification of PCD irradiated by UV nanosecond laser, which were not investigated before. Irradiated a bulk PCD in air using a UV nanosecond laser source to perform multi-pulse processing at a wavelength of 355nm. Based on the linear relation between the laser pulse energy density with crater diameter the Gaussian distribution of the laser intensity on the cross-section the ablation threshold of PCD was determined to be about 3.7326 J/cm 2 . And also investigated that the photochemical processing of UV nanosecond laser irradiation of PCD the sp 3 structure transforms to the sp 2 graphite phase. So, this study contributes a theoretical and experimental reference for the UV nanosecond laser micromachining of PCD material in research and manufacturing industries.