Modeling of the temperature field in nanosecond pulsed laser ablation of single crystalline diamond

• Published in: Diamond and related materials 2021-06, Vol.116, p.108402, Article 108402
• Main Authors: Zhang, Zhen, Zhang, Quanli, Wang, Yeqing, Xu, Jiuhua
• Format: Article
• Language: English
• Subjects: Ablation; Boundary conditions; Conduction heating; Conductive heat transfer; Crystal structure; Crystallinity; Diamond machining; Diamonds; Finite element method; Gaussian beams (optics); Grooves; Heat transfer; Laser ablation; Laser beams; Laser machining; Lasers; Material properties; Mathematical models; Nanosecond pulsed laser ablation; Nanosecond pulses; Optimization; Penetration depth; Process parameters; Pulsed lasers; Raman spectroscopy; Single crystalline diamond; Temperature dependence; Temperature distribution; Temperature field modeling; White light
• ISSN: 0925-9635; 1879-0062
• DOI: 10.1016/j.diamond.2021.108402

In this paper, a comprehensive finite element (FE) simulation model of the heat transfer for laser ablation of a single crystalline diamond (SCD) with a scanning laser beam in Gaussian shape is developed. The model takes into account the material properties, the geometric structure, and the thermal boundary conditions. It is employed to study the dependence of the temperature distribution under varying laser machining parameters. The distribution characteristics of the temperature field, the temperature evolution, and the heat conduction on the diamond surface are obtained, analyzed, and discussed. The law describing the influence of the laser parameters on the temperature field on the diamond surface is established. After comparing the numerically estimated thermal penetration depth of the pulsed laser in the diamond with the experimentally ablated groove characterized by a scanning electron microscope (SEM), a white light interferometer (WLI) and the Raman spectroscopy analysis of the deposited metamorphic layer, it is found that the developed model shows an excellent predictive capability and provides a promising tool for the future optimization of the machining parameters. [Display omitted] •The FE simulation model of the temperature field for SCD by laser ablation is established;•The distribution and evolution characteristics of the temperature field are obtained;•The achieved results show good feasibility for the optimization of the laser machining parameters.