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Thermal analysis of polymethyl methacrylate ablation by pulsed IR lasers

机译：脉冲红外激光对聚甲基丙烯酸甲酯烧蚀的热分析

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摘要

We present theoretical studies of polymethyl methacrylate (PMMA) ablation by single pulses of CO_2-laser radiation (9.17 μm) and by pulse trains of free-electron laser (FEL) operating in the wavelength range of 100-200 μm. Laser heating and vaporization of the PMMA sample and the mechanisms of ablation have been investigated for the particular experimental conditions. The theoretical description of laser-induced target heating and ablation is based on the widely used thermal model which allows one to describe mass removal over a fairly wide range of laser fluences from ablation threshold up to transition to phase explosion. It has been shown that, in contrast to metal ablation, PMMA ablation continues up to several milliseconds after laser pulse termination. Phase explosion aspects are analyzed on the basis of the target superheating data obtained by modeling. It has been demonstrated that, in the case of PMMA ablation, the pulsed regime of FEL can be modeled by continuous irradiation with the equivalent power. A methodology has been proposed to evaluate the absorption coefficients of PMMA for wavelengths of FEL, which are unknown at present, basing on the vaporization rate.
机译：我们目前通过单脉冲CO_2激光辐射（9.17μm）以及通过在100-200μm波长范围内工作的自由电子激光（FEL）的脉冲序列进行聚甲基丙烯酸甲酯（PMMA）烧蚀的理论研究。对于特定的实验条件，已经研究了PMMA样品的激光加热和汽化以及烧蚀的机理。激光诱导的目标加热和烧蚀的理论描述基于广泛使用的热模型，该模型可以描述从烧蚀阈值到过渡到相爆的相当大范围的激光注量的质量去除。已经表明，与金属烧蚀相比，PMMA烧蚀在激光脉冲终止后持续长达数毫秒。根据通过建模获得的目标过热数据分析相爆方面。已经证明，在PMMA消融的情况下，可以通过以等效功率连续照射来模拟FEL的脉冲状态。已经提出了一种基于汽化速率来评估目前未知的，对于FEL波长的PMMA吸收系数的方法。

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