使用自混合干涉测量法对多脉冲laser消融诱导的血浆积聚进行时间分辨定量
Time-resolved quantification of plasma accumulation induced by multi-pulse laser ablation using self-mixing interferometry
摘要：
本文提出了一种基于自混合干涉术（SMI）的多脉冲激光烧蚀等离子体羽流浓度探测方法。一个分析模型来解释单臂干涉信号的等离子体电子数密度。它的时间依赖性遵循幂律标度，这是由羽流积累和传播的并发影响。该模型已被应用于实验研究羽形成在不同的材料上的可变激光脉冲频率。羽流膨胀动力学已被观察到与高速成像，和SMI测量允许的时间分辨估计的电子数密度。SMI技术在鲁棒性和低侵入性方面的固有优势将允许其用作激光诱导羽流动态缩放的快速诊断工具。此外，它可以很容易地应用于基于激光的制造技术，其中等离子体浓度监测和控制是重要的。
英文摘要：
In this work a method based on self-mixing interferometry (SMI) is presented for probing the concentration of plasma plumes induced by multi-pulse laser ablation. An analytical model is developed to interpret the single-arm interferometric signal in terms of plasma electron number density. Its time dependence follows a power-law scaling which is determined by concurrent effects of plume accumulation and propagation. The model has been applied for the experimental study of plume formation at variable laser pulse frequencies on different materials. The plume expansion dynamics has been observed with high-speed imaging, and the SMI measurements allowed for a time-resolved estimation of the electron number density. The intrinsic advantages of the SMI technique in terms of robustness and low intrusiveness would allow for its usage as a fast diagnostic tool for the dynamical scaling of laser-induced plumes. Moreover it can be easily applied in laser-based manufacturing technologies where plasma concentration monitoring and control is important.
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