Due to its high electrical and thermal conductivity, there are many demands for three-dimensional printing of copper materials. For the fancy promise, multiple types of metal 3D printing technologies have shown a fabulous demonstration of complex and intricate examples. However, the high thermal conductivity causes thermal damage to the surrounding substrates and high power requirements due to the low energy absorption in the IR laser range are still a big challenge in the field of 3D printed electronics demanding pure copper electric conductivity. KNU has searched for the solution and found a way by applying a very short duration laser. Short duration lasers such as picosecond or femtosecond lasers generate a reduced volume of plasma at the focal point as a result of limited heat transfer to the surrounding medium and localized nonlinear photon absorption. This study will present the experimental results to show the feasibility of sintering copper powder on the 3D printed substrate using a 1-watt femtosecond laser. For 3D printed electronics applications, the presentation will discuss the thermal effect of femtolaser sintering on the printed substrate and enhancement of electrical capacity.
- Understand how femto laser sinters copper powder
- Understand the benefit of using femto laser in 3D printed electronics fabrication