Fibre vs. CO₂ vs. UV: Which Laser Marker Should I Choose?

The most important difference between Fibre, CO₂ and UV laser markers is the wavelength of light they produce.
Short wavelengths typically have more energy and a higher absorption rate than long wavelengths. As a result, a laser's wavelength affects its ability to mark certain materials.

The features of and marking examples for the different wavelength types are introduced below.

Fibre lasers have a 1090 nm wavelength, making them IR (infrared) lasers. Fibre lasers can mark a wide range of materials, though they are optimised for metal marking applications. Their high power makes them perfect for annealing and engraving applications, but they cannot mark transparent objects since IR light passes straight through.

CO₂ lasers have 10x the wavelength of standard wavelength systems. They're great at marking paper, resins, wood, rubber and transparent materials (like glass and PET). However, it's nearly impossible to mark metal with a CO₂ laser marker because the laser light is not absorbed.

UV lasers use a highly absorbable wavelength (355 nm) to mark parts. This high absorption rate allows UV lasers to perform "cold marking" (i.e. marking without extra heat stress). As a result, UV lasers are ideal for applications that require high-contrast or minimal product damage.

These videos compare Fibre, CO₂ and UV laser marks on different materials.

Fibre lasers can quickly mark the widest range of materials and typically produce the most contrast on metals. However, fibre lasers cannot mark transparent materials and will sometimes damage the marking surface.
UV lasers provide the most contrast on resins. UV lasers have the added benefit of creating damage-free marks.
CO₂ lasers burn the target with heat, making them ideal for marking wood, paper, ceramic and transparent targets.

Laser marking, whether it is fibre laser vs CO₂ or UV-driven, is used widely for many applications. Each has its own advantages depending on the material and production needs. Fibre lasers, for example, are ideal for marking on metals in the automotive industry, such as engraving serial numbers on engine parts or for deep marking aerospace components like titanium bolts. Electronic manufacturers use them as well to mark circuit boards and metal connectors.

CO₂ lasers excel at coding expiration dates on food packaging, engraving branding on glass beverage bottles, or cutting intricate designs into wooden furniture. UV lasers are ideal for producing high-contrast markings on silicon wafers used in electronics manufacturing, engraving precise codes on medical devices without causing damage to plastic surfaces, and marking logos on cosmetic containers.

When selecting between a UV, fibre laser vs CO₂ laser for your production line, the material type, required marking speed, and operational needs should be considered. Fibre laser machines use higher average powers and have powerful marking capabilities, making them ideal for metal and industrial applications. Being that these systems offer high-speed, deep engraving, achieving long-lasting results is possible.

On the other hand, CO₂ lasers have a longer wavelength. Cutting and engraving non-metallic, organic materials such as glass, acrylic, and textiles is simplified, making them ideal for packaging and consumer goods industries. UV laser systems, however, use short-wavelength light. When high-precision marking is required on delicate materials like plastics, semiconductors, and medical devices, UV lasers are often a wise choice. No heat-related damage occurs to sensitive surfaces which may happen with other laser marking methods.

The good news is that regardless of your materials and industry requirements, there is a right-fit laser type available. Choosing the correct equipment optimises production line efficiency, reducing downtime and speeding up operations.

Every manufacturing environment is unique in its own right. Deciding between a fibre laser vs CO₂ or UV lasers depends on understanding your manufacturing process, material requirements, and desired output quality. Facility layout, employee safety, and operational efficiency may influence decisions on what laser marking equipment works best. Fibre lasers, as an example, may require less maintenance and downtime, reducing strain on employees who are busy with other tasks.

CO₂ lasers, which can be bulkier, might need specific space considerations, ensuring both the facility and workforce can handle the equipment’s demands. UV lasers, with their precision and minimal heat, may be favoured in environments where sensitive materials and worker safety are prioritised. Manufacturing includes many moving parts. By carefully weighing these factors, you can smoothly integrate new equipment and improve overall productivity.

When the question comes up of whether fibre vs. CO₂ laser or UV laser is best, we understand that you still may have questions. KEYENCE offers a versatile range of laser markers designed to meet your specific needs. Contact us today to speak with a specialist or receive a product demo.