Laser marking by the annealing technique:
This technique allow us to work without ablation of material. Due to the interaction of the laser beam, the material is locally heated to a temperature close to its melting point.
The marking of the piece is due to a thermal effect and lead to a change of the colour.
Several colours are possible depending of exposure time, power, repetition rate of the laser and composition of the material.
Laser marking by annealing concerns only metals, in particular titanium and ferrous metals (steel, stainless steel, etc.).