Laser engraving is process of removing material to leave a more or less deep track, which will reveal a impression of the design. Laser engraving is permanent marking system, extremely flexible to identify parts and components. Laser marking systems increasingly replacing other more expensive and less efficient marking systems such as pad printing, hot stamping and screen printing.
Material can be removed by laser in three ways. The first, the most conventional, consists of focusing a sufficiently powerful laser beam on a size comparable to the diameter of a hair. This high power density leads to highly localised heating of the material, then its vaporisation. With the vaporisation being able to occur in less than a microsecond, only pulsed lasers are used for this process as they enable the high power required for vaporisation to be reached in a very short time but with a low average power. By sweeping the beam with a scanner according to a predefined pattern, the material will be removed according to a text, image or any other form drawn in a CAD software package.
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