Adjustable pulse durations with MOPA technology
Thanks to the short pulses, which can be variably adjusted (between 4 and 200 ns) with the MOPA laser, and thanks to the low pulse energy, the surrounding material is less heated. This results in less burning and foaming. Especially on dark plastics, the shorter pulses can often produce “nicer”, lighter laser markings, resulting in a better contrast and thus better machine readability.
These dark plastics are characterised by a high reactivity to the laser beam. Thus, short pulses with relatively little heating of the material are necessary and sufficient here. In addition, there are also plastics that require more energy to sufficiently foam or boil up the material. Here, both a conventional fiber laser with longer pulse durations and high pulse energies and the MOPA technology are suitable. With the MOPA laser, even longer pulses are possible, whereby the controlled foaming can be optimised.