More possibilities for laser marking plastics
With a fiber laser you can mark a wide range of plastics. Due to the different chemical compositions of the plastics, the result is very different. While the marking result with a conventional fiber laser is very good with some plastics, other plastics are less homogeneous or rich in contrast when marked. These plastics - especially dark plastics (e.g. PA 66 GF, PA 6 GF, PP GF, etc.) - can often be marked much lighter or more homogeneously with a MOPA laser. The advantage of the MOPA technology is the selectable pulse durations of the laser. This results in more options when choosing laser parameters. This can lead to a better marking quality, better contrasts, etc. for the plastics mentioned above.
The material is heated during laser marking. By heating the material, the color of many plastics changes (e.g. by changing color or carbonizing), resulting in a contrast and thus the marking. In conventional fiber lasers, the pulse duration is relatively long (100 ns), whereby the material burns or boils up or foams in some plastics. For these plastics (e.g. many dark plastics that turn light), the MOPA laser provides the ideal solution.
More information about MOPA laser