Effect of the dynamic absorptance of a metallic target surface on pulsed laser ablation

✍ Scribed by Li, Li ;Zhang, Duanming ;Li, Zhihua ;Guan, Li ;Tan, Xinyu ;Liu, Dan ;Fang, Ranran

• Publisher: John Wiley and Sons
• Year: 2006
• Tongue: English
• Weight: 731 KB
• Volume: 203
• Category: Article
• ISSN: 0031-8965
• DOI: 10.1002/pssa.200521114

✦ Synopsis

Abstract

A theoretical model of pulsed laser ablation (PLA) considering the dynamic absorptance of a target surface is proposed. First, the expression for the dynamic absorptance as a function of irradiation time and incident laser intensity is derived. The incident laser intensity is assumed to be expressed by a Gauss function, which more closely approaches the actual case. The heat conduction equation considering the dynamic absorptance and the Gaussian distribution of laser intensity is then set up. Using tungsten as an example, the evolution of the absorptance with irradiation time and intensity before melting and after melting is numerically simulated, as well as the evolution of temperature with time. In addition, the evolution of melt depth with time is given. The effects of the dynamic absorptance on PLA are investigated in detail, especially for the evolution of temperature with time for the melt layer. Results show the dynamic absorptance affects the simulated results markedly, and its effects on the target temperature after melting become stronger than those before melting. A comparison of the calculated results with experimental data shows that the dynamic absorptance plays an important role during PLA. (© 2006 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)