A comprehensive study of the long pulse Nd:YAG laser drilling of multi-layer carbon fibre composites

The path towards delamination-free drilling of composite materials

“…Rodden et al studied the long-pulse Nd:YAG laser drilling of multi-layer carbon fiber composites [110]. For pulsed drilling, the exit hole diameter is a function of pulse energy and material thickness.…”

Ablation behaviors of carbon reinforced polymer composites by laser of different operation modes

“…Therefore, in order to improve the process quality as well as reduce energy consumption, it is natural to hope the thermal energy to be largely confined to a small specific region to only make the materials therein evaporate without affecting the adjacent region [4]. In physics, this actually requires high spatial and temporal concentration of the laser energy, which could be realized through focusing the laser beam and shortening the laser duration [5]. From such point of view, one can immediately understand that the laser energy would be greatly wasted as too much material is heated up beyond the objective region if the laser power density is too low or the exposure duration is too long [6,7].…”

Characterization of the drilling alumina ceramic using Nd:YAG pulsed laser

“…Laser hole drilling in materials such as polyLaser drilling has many controlling parameters to obtain desired hole characteristics such as depth, entrance and exit diameters, circularities. Drilling characteristics are determined by exit hole diameter as a function of material thickness and pulse energy for the single pulse drilling of the material (Rodden et al, 2002). Rodden et al also give information on the laser parameters required the holes of required dimensions with a single pulse, or, in the case of multiple pulses drilling, allows the number of pulses to drill a required thickness to be estimated.…”