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 mu m 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 lasersuperposed spots, resulting in a reduction in the retardation value by similar to 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.