This process is effective mainly on plastics. The power of the laser beam targets individual molecules, for example, colour pigments, then destroys or changes their structure. For this the material and laser wavelength must be exactly adjusted to each other.
Above the characteristic threshold energy, according to the process, the material changes colour by absorbing the laser beam. A change in colour or bleaching then becomes visible on the places worked on, but the surface of the material remains virtually the same.
Colour change on a plastic part
Only if the material and laser wavelength have been exactly adjusted to each other the colour molecules can have their colour changed or be bleached. This process is particularly mild on the workpiece and its surface. However, it does require thorough preparation and optimum adjustment of the workpiece structure to the laser wavelength.
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