论文部分内容阅读
为揭示激光诱导金属表面周期结构的阈值现象及规律的物理本质,实验研究了飞秒脉冲激光在不同实验参数条件下烧蚀铜、铝、银3种金属靶材表面产生的形貌变化,提出激光能量累积效应机制来定量解释激光诱导表面周期结构(LIPSSs)存在单脉冲能量密度阈值与脉冲数阈值的原因及其变化规律。基于激光脉冲能量时空上高斯分布假设和能量累积效应,定量讨论了飞秒激光动态扫描速度和激光脉冲能量密度对产生的表面周期性结构质量的影响,理论和实验结果符合较好。
In order to reveal the threshold phenomenon and the regular physical nature of the periodic structure of laser-induced metal surface, the morphologies of three kinds of metal targets ablated by femtosecond pulse laser under different experimental parameters were experimentally investigated. Laser energy accumulation effect mechanism to quantitatively explain the reasons and the changing rules of single pulse energy density threshold and pulse number threshold in laser induced surface periodic structure (LIPSSs). Based on the assumption of Gaussian distribution and energy accumulation in space-time of laser pulse energy, the influence of the dynamic scanning velocity of femtosecond laser and the energy density of laser pulse on the periodic structure quality is discussed theoretically and experimentally.