Laser engraving (engraving with a marking laser) involves a significant removal of material from the surface of the workpiece. It must be distinguished from laser marking (marking with a marking laser).
In engraving, the entire average power of the laser is concentrated in the focus, which results in a very high power or energy density. The interaction with the material is referred to as fluence. It is a measure of the energy density required in laser engraving to cause a change in the material.
Due to the high concentration of energy, the material heats up very quickly, expands or stretches and is thus ejected from the interaction joint. This allows material to be removed in a targeted manner during laser engraving, making the marking very robust and durable. Many materials can be used for engraving. These include metal, wood and glass.