Why can laser marking machine print multiple colors?

in FAQs about Laser Marking, , , ,

In fact, ordinary laser marking machines cannot produce color effects. Mainly because it recognizes the effect by the depth created by the instantaneous vaporization of the surface of the material by the high temperature generated by the laser focusing.

However, there is a color laser marking machine. The main reason for this is the use of multiple laser paths acting on the same area and setting different laser parameters to obtain a surface diffraction grating. So lasers for such applications must also be capable of a wide range of frequencies, speeds, powers, spacing settings, focal lengths, and more.

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