Universal threshold for femtosecond laser ablation with oblique illumination

Universal threshold for femtosecond laser ablation with oblique illumination
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倾斜照明飞秒激光烧蚀的通用阈值

DOI:
10.1063/1.4965850
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发表时间:
2016-08
影响因子:
4
通讯作者:
Polynkin Pavel
Polynkin Pavel
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Liu Xiao-Long;Cheng Weibo;Petrarca Massimo;Polynkin Pavel

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我们量化的单次烧蚀阈值的飞秒激光束的入射角和偏振的依赖关系,为三个不同的固态材料:金属,电介质和半导体。利用恒定的线性折射率值,我们计算了在烧蚀阈值点处通过空气-材料界面传输的激光能量密度。我们表明,尽管在烧蚀过程中涉及的高度非线性电离动力学,因此定义的透射阈值通量是普遍独立的入射角和偏振的激光束的所有三种材料类型。我们认为,角度依赖性的烧蚀阈值可以用来轮廓的通量分布在超强飞秒激光束。
We quantify the dependence of the single-shot ablation threshold on the angle of incidence and polarization of a femtosecond laser beam, for three dissimilar solid-state materials: a metal, a dielectric and a semiconductor. Using the constant, linear value of the index of refraction, we calculate the laser fluence transmitted through the air-material interface at the point of ablation threshold. We show that, in spite of the highly nonlinear ionization dynamics involved in the ablation process, the so defined transmitted threshold fluence is universally independent of the angle of incidence and polarization of the laser beam for all three material types. We suggest that angular dependence of ablation threshold can be utilized for profiling fluence distributions in ultra-intense femtosecond laser beams.
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