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Maximizing laser ablation efficiency of silicon through optimization of the temporal pulse shape

机译:通过优化时间脉冲形状来最大化硅的激光烧蚀效率

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The commercial availability of fiber lasers based on MOPA architectures with arbitrary temporal pulse shaping capabilities offers completely new possibilities for laser material processing. In this study, based on numerical modeling results in the nanosecond regime for the case of silicon at 1064 nm wavelength, we show that not only the single pulse laser ablation efficiency depends on the temporal pulse shape but, we also demonstrate how a stochastic approach can be applied in order to reach an optimized pulse shape maximizing the material vaporization rate for given laser pulse energy and duration. Experimental results are compared to the numerical modeling results, and the discrepancies are discussed in terms of the role played by plasma shielding effects and melt ejection at high intensity.
机译:基于具有任意时间脉冲整形功能的MOPA架构的光纤激光器的商业可用性为激光材料加工提供了全新的可能性。在这项研究中,基于在1064 nm波长的硅情况下的纳秒制数值模拟结果,我们表明不仅单脉冲激光烧蚀效率取决于时间脉冲形状,而且还证明了随机方法如何能够为了在给定的激光脉冲能量和持续时间下达到最大的材料汽化速率,可以达到最佳的脉冲形状。将实验结果与数值模拟结果进行了比较,并就等离子体屏蔽效应和高强度熔体喷射所起的作用进行了讨论。

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