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 Plastics
It is very difficult to make recommendations
for all plastics. All materials which show colour variations when
working with an Nd:YAG laser profit from short pulses.
Some materials are best marked with shorter wavelengths,
as for instance offered by frequency-multiplied solid-state lasers.
CO2 lasers produce marking results similar to hot embossing,
where the marking becomes visible only by the shadow of the engraving.
One of the applications where this effect is desirable is the marking
of audio and data CD-ROMs.
Another application, where high marking speeds
and high contrast of the characters are required, is the marking
of ear tags.
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