Our work is to improve the generation of 3D flexible structures by laser micromachining.
The purpose is to extract the material by an ablation of matter in order to achieve
multi-bend structure. This multi-bend part will be the key for 3D structures. For
that, a frequency multiplied Nd:YAG laser equipped with a galvanometric head was used.
For optimizing the laser irradiation time and power a thermal modeling of the laser
matter interaction for a continuous laser impact case is presented. The paper models
numerically the localized three-dimensional temperature distribution in a polyimide
caused by a moving Gaussian laser beam by FEM (Finite Element Method) analysis. The
beam’s penetration depth, which can be described with an absorption coefficient, depends
on the ambient temperature. The model examines the penetration depth and the influences
of the laser motion on the transient temperature distribution. As the maximum temperature
is mesh dependent we decided to chose 10 μm initial mesh with 1.01 mesh grow, so the
laser beam diameter occurs 20 μm. The overall heat flux and temperature distribution
on a macroscopic level are both accurate.