Image: LightPulse LASER PRECISION
The second advantage of the extremely short pulses is that in this time range the material does not yet react thermally to the deposited energy. In contrast to longer-pulse systems, the material is not heated and melted here, but changes directly from the solid to the gaseous state by breaking electron bonds and vaporizes. This process is often referred to as “cold” removal and results in no or only marginal thermal influence on the remaining material and an undefined melt formation is avoided.
This process, known as sublimation, is an essential factor for the high precision in ultra-short pulse laser processing.