Comparison of laser glass cutting process using ps and fs lasers

The glass cutting has been developed long time over thousands years. To achieve technology innovation, non-contact laser cutting has been actively studied and developed in volume production industries including LCD and AMOLED sectors recently. From the early 21st century, CO₂ laser cutting using heating and water-quenching method has been actively evaluated due to its innovative process and several companies adapted this method for production. Infrared ps and fs lasers ar no longer transparent in glass and its intensity is high enough to ablate the glass material. Pulse widths for ps and fs lasers are short enough to create good ablation and prevent from crack formation. However, ps and fs laser glass-cutting is not widely used due to the issues in speed and quality. In this paper, ps and fs laser processes for various glasses are investigated focusing on cutting quality in edge and side-wall. Cutting morphology is analysed through striation and fracture on cut-surface. Also, more efficient laser cutting method is tried by crack formation and its propagation along the cutting direction.