外文题目: Damage morphology and mechanism in ablation cutting of thin glass sheets with picosecond pulsed lasers
作者: Sun, Mingying; Eppelt, Urs; Hartmann, Claudia; Schulz, Wolfgang; Zhu, Jianqiang; Lin, Zunqi
刊名: Opt. Laser Technol.
年: 2016 卷: 80 页： 227--236
英文关键词:
Laser damage; Glass; Ultrafast lasers; Laser materials processing; Heat accumulation; Cracks
HIGH REPETITION RATES; FEMTOSECOND LASER; INTERNAL MODIFICATION; BULK GLASS; IRRADIATION
英文摘要:
We experimentally investigated the morphology and mechanism of laser-induced damage in the ablation cutting of thin glass sheets with picosecond pulsed lasers and we compared the experimental results to our models. After several passes of laser ablation, we observed two different kinds of damage morphologies on the cross-section of the cut channel. They are distinguished to be the damage region caused by high-density free-electrons and the heat-affected zone due to the heat accumulation, respectively. Furthermore, micro-cracks can be observed on the top surface of the workpiece near the cut edge. The nano-cracks could be generated by high energy free-electrons but opened and developed to be visible micro-cracks by thermal stress generated in the heat-affected zone. The crack length was proportional to the volume of heat-affected zone. Heat-affected-zone and visible-cracks free conditions of glass cutting were achieved by controlling the repetition rate and spatial overlap of laser pulses. (C) 2016 Elsevier Ltd. All rights reserved.


文献类型: 期刊论文
正文语种: English
收录类别: SCIEI
DOI: 10.1016/j.optlastec.2016.01.023


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