Reaching over 500 MPa maximum flexural strength in ultra-thin glass via CO2 laser fusion cutting

The authors demonstrated the cutting of ultra-thin glass (UTG) with a thickness of 100 μm using a laser fusion cutting approach, which showed significant potential for drastically improving flexural strength. The authors proposed a novel control method for optimizing the edge shape to avoid previously reported drooping. Additionally, the authors presented guidelines for reducing the residual stress on the glass edge using two laser-superposed spots, resulting in a reduction in the retardation value by ∼ 43 %. The two-point bending test indicated that the maximum strength exceeded 500 MPa, whereas the minimum strength was approximately 100 MPa, which was likely caused by spatter deposition.