Dudutis Juozas, Zubauskas Laimis, Daknys Eimantas, Markauskas Edgaras, Gvozdaitė Rasa, Račiukaitis Gediminas, Gečys Paulius
Opt Express. 2022 Jan 31;30(3):4564-4582. doi: 10.1364/OE.447143.
The growing applicability of glass materials drives the development of novel processing methods, which usually lack comprehensive comparison to conventional or state-of-art ones. That is especially delicate for assessing the flexural strength of glass, which is highly dependent on many factors. This paper compares the traditional top-down laser ablation methods in the air to those assisted with a flowing water film using picosecond pulses. Furthermore, the bottom-up cutting method using picosecond and nanosecond pulses is investigated as well. The cutting quality, sidewall roughness, subsurface damage and the four-point bending strength of 1 mm-thick soda-lime glass are evaluated. The flexural strength of top-down cut samples is highly reduced due to heat accumulation-induced cracks, strictly orientated along the sidewall. The subsurface crack propagation can be reduced using water-assisted processing, leading to the highest flexural strength among investigated techniques. Although bottom-up cut samples have lower flexural strength than water-assisted, bottom-up technology allows us to achieve higher cutting speed, taper-less sidewalls, and better quality on the rear side surface and is preferable for thick glass processing.
玻璃材料不断增长的适用性推动了新型加工方法的发展，而这些方法通常缺乏与传统或现有技术的全面比较。这对于评估玻璃的抗弯强度尤为棘手，因为抗弯强度高度依赖于许多因素。本文将空气中传统的自上而下激光烧蚀方法与使用皮秒脉冲并辅以流动水膜的方法进行了比较。此外，还研究了使用皮秒和纳秒脉冲的自下而上切割方法。对1毫米厚的钠钙玻璃的切割质量、侧壁粗糙度、亚表面损伤和四点弯曲强度进行了评估。由于热积累导致的裂纹，自上而下切割样品的抗弯强度大幅降低，这些裂纹严格沿侧壁分布。使用水辅助加工可以减少亚表面裂纹扩展，在所研究的技术中产生最高的抗弯强度。尽管自下而上切割的样品抗弯强度低于水辅助切割的样品，但自下而上技术使我们能够实现更高的切割速度、无锥度的侧壁以及背面更好的质量，并且更适合厚玻璃加工。
