Ultrashort laser irradiation of metal targets results in a variety of coupled processes, such as energy deposition on surface, electron-ion heating and diffusion, as well as thermal ablation and plasma expansion, mechanical rupture below the surface, and melt flow, modifying the initial surface morphology on micro/nanometric scales. Multidimensional simulations capable to predict the consequences of inhomogeneous absorption on hydrodynamic processes are performed in order to elucidate the mechanisms of surface micro/nanostructure formation and material removal during multipulse laser ablation in regimes below, near and above laser ablation threshold. On one hand, the numerical results suggest new ways of control over the properties of periodic and aperiodic surface structures. On the other hand, the strategies to reduce the surface roughness and to improve the quality and the effciency of ultrashort laser ablation are discussed.

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Anton Rudenko, Cyril Mauclair, Florence Garrelie, Razvan Stoian, and Jean-Philippe Colombier, "Multipulse dynamics of ultrashort laser interaction with metal targets by coupled electromagnetic and hydrodynamic simulations (Conference Presentation)," Proc. SPIE 10906, Laser-based Micro- and Nanoprocessing XIII, 109060B (Presented at SPIE LASE: February 05, 2019; Published: 4 March 2019); https://doi.org/10.1117/12.2507222.6008599066001.