Depending on the application and task, different lasers are used to produce micro-holes. While excimer or solid-state lasers in the UV range are often used for plastics, solid-state lasers in the visible or infrared spectral range are mainly used for metal processing.
The size of the holes depends, among other things, on the material, beam source, pulse duration, and energy density. Therefore it can vary from a few micrometers to several millimeters. Another decisive factor is the choice of a drilling technique.