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飞秒激光诱导金属表面周期性自组织微纳米条纹结构,在调控热辐射源、摩擦、超亲水性、超疏水性和打标等方面具有广泛的应用前景.研究了800nm飞秒激光诱导金属钨表面周期性自组织结构的形成规律和形成机理.采用Sipe干涉模型和有限时域差分法,仿真了第1个飞秒激光脉冲刻蚀后随机粗糙表面引起的激光电磁场能量表面分布和第20个脉冲后低空间频率条纹结构引起的激光电磁场能量表面分布.揭示了低空间频率条纹与高空间频率条纹的形成机理,考察了表面微观形貌的演化和条纹周期随着脉冲增多而递减的现象.
Femtosecond laser-induced periodic self-organized micro-nano stripe structure on metal surface has wide application prospects in the regulation of heat radiation source, friction, superhydrophilicity, superhydrophobicity and marking, etc. The effects of 800nm femtosecond laser induced metal The formation regularity and formation mechanism of periodic self-organized structure of tungsten surface. The Sipe interference model and the finite difference time-domain method were used to simulate the surface energy distribution of laser electromagnetic field caused by random rough surface after the first femtosecond laser pulse etching. After the pulse, the energy surface distribution of the laser electromagnetic field caused by the low spatial frequency stripe structure is revealed. The formation mechanism of the low spatial frequency stripe and the high spatial frequency stripe is revealed, and the evolution of the surface microscopic morphology and the decrease of the stripe period as the pulse increases .