CO2 marking holds its ground wherever the material is organic
Fiber lasers displaced CO2 across metals. On wood, paper, leather, glass and many plastics, the 10.6 µm wavelength still couples better.
The rise of fiber lasers removed CO2 from most metal marking applications: better efficiency, no gas or mirror maintenance, smaller footprint, lower cost per watt. What that narrative misses is the set of materials where the wavelength difference decides the outcome.
Why wavelength matters here
Organic materials — wood, paper, card, leather, textiles, many polymers — absorb strongly at 10.6 µm and poorly at 1 µm. A fiber laser aimed at untreated wood or paper often does very little, while a CO2 laser cuts and marks it readily.
Glass behaves similarly. It is transparent at 1 µm and absorbing at 10.6 µm, which makes CO2 the practical choice for glass marking and engraving outside of specialised ultrafast approaches.
Where CO2 remains standard
Packaging. Date and batch coding on cartons, labels and films at line speed.
Wood and leather goods. Engraving, cutting and decorative work.
Textiles. Cutting and perforating, including denim finishing.
Acrylic. CO2 cuts acrylic with a flame-polished edge that no other process matches economically.
Glass. Marking and frosting.
What has changed within CO2
Sealed RF-excited tubes replaced older flowing-gas designs in most industrial marking, removing gas handling and improving reliability substantially. Lifetimes are long enough that maintenance is no longer the differentiator it was.
Lower-power sealed sources have become inexpensive, which is part of why CO2 dominates in packaging coding where the required power is modest.
The selection question
Rather than asking which laser type is better, the practical question is what the material absorbs. A shop marking metals should buy fiber. A shop marking packaging, wood or acrylic should buy CO2. A shop doing both should expect to own both.
The mistake worth avoiding is buying a fiber marker on the strength of general industry direction and then discovering that the actual work is on materials it barely affects — which happens more often than the state of the technology would suggest.
This article was produced by the LasersNews AI desk and reviewed by our editors.
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