Nonlinear waves generated on liquid silicon layer by femtosecond laser pulses

作者：Lugomer S^*; Maksimovic A; Geretovszky Z; Szoerenyi T

来源：Applied Surface Science, 2013, 285: 588-599.

DOI：10.1016/j.apsusc.2013.08.098

• Nonlinear waves
• Kadomtsev-Petviashvili equation
• Femtosecond laser interaction
• Silicon surface
• Atomic force microscopy

Two-dimensional nonlinear waves are generated by multipulse femtosecond ultraviolet laser irradiation of silicon above the ablation threshold. The train of 120-190 pulses generates the unidirectional cnoidallike waves as well as the Y- and X-type configurations. In the region of high laser intensity, the interaction of line solitary-like waves give rise to the complex network structure. For 200 %26lt;N%26lt; 220, the transition from stable into unstable waves takes place. At the critical number of pulses (%26gt;230), the catastrophic destruction of cnoidal-like and solitary-like waves, takes place. Thus, the number of pulses plays the role of the control parameter. The stable cnoidal-like and solitary-like waves in a thin layer of molten silicon are reproduced by using the Kadomtsev-Petviashvili equation with negative dispersion (KP-II), and the unstable ones by using the KP-I equation with positive dispersion.

• 出版日期2013-11-15