Multidiagnostic analysis of ultrafast laser ablation of metals with pulse pair irradiation
Multidiagnostic analysis of ultrafast laser ablation of metals with pulse pair irradiation
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DOI：
10.1063/1.3516491
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发表时间：
2010-12
影响因子：
3.2
通讯作者：
S. Amoruso;R. Bruzzese;Xuan Wang;G. O'Connell;J. Lunney
中科院分区：
文献类型：
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作者：
S. Amoruso;R. Bruzzese;Xuan Wang;G. O'Connell;J. Lunney
铜靶在烧蚀制度中由成对的相等的，时间延迟的共线的激光脉冲分开的时间尺度从102 ps到102 ns的照射。烧蚀羽流的特征在于离子探针诊断，快速成像，时间和空间分辨的光学发射光谱。通过接触式轮廓仪测量烧蚀坑轮廓，分析了烧蚀效率随脉冲延迟的变化规律。第二激光脉冲修改由第一脉冲产生的等离子体羽流的特性和烧蚀效率。对双脉冲超快激光烧蚀的不同机理进行了分析和讨论。实验结果被解释在一个简单的模型的第二个脉冲与新生的烧蚀羽流产生的第一个脉冲的相互作用的框架。该模型产生一致的和定量的协议与实验结果预测所观察到的烧蚀深度的实验趋势…
Copper targets are irradiated in the ablation regime by pairs of equal, time-delayed collinear laser pulses separated on a timescale going from ≈2 ps to ≈2 ns. The ablation plume is characterized by ion probe diagnostic, fast imaging, and temporally and spatially resolved optical emission spectroscopy. The variation in the ablation efficiency with the delay between the pulses is analyzed by measuring the ablation crater profile with a contact profilometer. The second laser pulse modifies the characteristics of the plasma plume produced by the first pulse and the ablation efficiency. The different mechanisms involved in double pulse ultrafast laser ablation are identified and discussed. The experimental findings are interpreted in the frame of a simple model of the interaction of the second pulse with the nascent ablation plume produced by the first pulse. This model yields consistent and quantitative agreement with the experimental findings predicting the observed experimental trends of the ablation depth...