Characteristics of Nanosecond Laser-Irradiated Damage inSingle-Layer Graphene on Fused Silica Substrate

In this work, the chemical vapor deposition method was adopted to deposit a single-layer graphene on a copper foil, which was then transferred to a fused silica substrate using the wet chemical method.Then, using the phase-contrast microscopy and the scanning electron microscopy, we studied the damage threshold, the damage probability, the damage morphology and the microstructure of the as-prepared graphene layer irradiated by a nanosecond ultraviolet laser pulse.The experimental results show that the absorptivity of the single-layer graphene produced is 2.38% at 550nm, close to the theoretical value of 2.3%, and the measured laser-induced damage threshold is 78mJ/cm² after irradiation with a wavelength of 355nm and a pulse width of 5.8ns.Moreover, we observed spherical carbon balls and carbon flowers in the laser-irradiated zone under relatively low fluence conditions, ablation framework of porous carbon at damage threshold fluence, and laser-induced nano-scale voids and folds of graphene under high-fluence laser irradiation.