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Thermal Effects in Femtosecond Laser Ablation of Metals

机译：飞秒激光烧蚀金属的热效应

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摘要

With recent advances in ultrafast laser technology, ablation using femtosecond laser pulses has found a wide range of applications. It is widely believed that ablation using femtosecond lasers has many unique advantages compared to longer-pulse ablation. One of the most significant features is believed to be that a negligible amount of energy should remain in the sample following ablation because the deposited heat does not have enough time to travel into the bulk sample during the femtosecond laser pulse. In this paper, we discuss our new findings on thermal effects in femtosecond laser ablation of metals. In contrast to the previous common belief, we find that a significant amount of residual thermal energy is deposited in metal samples following multi-shot femtosecond laser ablation. We further discuss how the absorptance of metals depends on the structural modifications. Lastly, we discuss the formation of periodic surface structures on metals induced by femtosecond laser pulses.
机译：随着超快激光技术的最新发展，使用飞秒激光脉冲的消融已发现了广泛的应用。普遍认为，与长脉冲消融相比，使用飞秒激光进行消融具有许多独特的优势。认为最重要的特征之一是消融后样品中应保留少量能量，因为在飞秒激光脉冲过程中沉积的热量没有足够的时间进入块状样品。在本文中，我们讨论了飞秒激光烧蚀金属中热效应的新发现。与以前的普遍看法相反，我们发现在多次飞秒飞秒激光烧蚀之后，金属样品中沉积了大量残余热能。我们进一步讨论金属的吸收率如何取决于结构修饰。最后，我们讨论了飞秒激光脉冲在金属上形成周期性表面结构的过程。

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