Why you should choose infrared picosecond or quansi-picosecond MOPA fiber laser to black mark stainless steel products
Due to the MOPA fiber laser‘s continuous price reduction and popularity, many stainless steel product manufacturers are torn whether to use the MOPA fiber laser for stainless steel products for the appearance of personalized marking.
The use of MOPA laser marking machine for positive focus marking thermal effect is small, you can get a deeper blue-black marking or dark gray engraving effect, but the speed is slower; off-focus laser marking can be obtained on the surface of non-invasive pure black marking, but the small angle or reflective conditions seem to reduce the contrast of the color of gray, and the processing of heat generation is greater for the smaller or thinner stainless steel workpiece is prone to thermal deformation, or the internal components of stainless steel shell products.
Stainless steel shell products within the component structure of the damage, such as plastic structural components and electronic circuit boards on the melting of components.
Using high-speed MOPA lasers with pulse widths of 200 ps or less (commonly known as infrared quasi-picosecond lasers or picosecond lasers), chromium and carbon can be precipitated from stainless steel to form microstructures that produce smooth, flat and permanent markings that appear pure black from all angles. These microstructures are extremely stable and resistant to corrosion and abrasion, ensuring permanent, visible and high-contrast marking even with aggressive cleaning agents, and are therefore widely used for UDI marking of stainless steel products for medical applications, such as scalpels.
In addition, the efficiency of black marking with a high-speed MOPA laser is far superior to that of conventional MOPA laser annealing. For example, a 10*12 mm standard QR code (ISO IEC TR 29158 or called AIM-DPM) can be marked in 15 seconds with an infrared picosecond laser and 50 seconds with an infrared quasi-picosecond laser while annealing with a standard MOPA laser takes more than 5 minutes.
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Application Context for Why you should choose infrared picosecond or quansi-picosecond MOPA fiber laser to black mark stainless steel products
This page is part of CNMarking’s Fiber and MOPA laser marking content library. For buyers comparing similar equipment, the key question is not only whether the sample can be marked, cleaned, welded, or processed, but also whether the final setup can match production speed, fixture stability, marking depth, visual quality, and long-term maintenance requirements. The application is most relevant to high-contrast marking, anodized layer removal, QR codes, logos, serial numbers, and precision metal surface treatment.
When evaluating a similar project, CNMarking normally checks the workpiece material, available marking area, expected cycle time, required code or logo content, fixture method, safety enclosure needs, and whether the process must connect with an existing line, MES, scanner, or operator workflow. These details help choose between a standard machine, a semi-custom workstation, or a fully automated solution.
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How to Choose a Similar Setup
- Send clear photos or drawings of the workpiece, including the required marking or processing position.
- Confirm the material, surface coating, required depth or contrast, and any durability requirements after cleaning, painting, heat treatment, or outdoor use.
- Share the expected production rhythm, such as pieces per hour, operator loading method, fixture constraints, and whether automatic code reading is required.
- For new applications, request sample testing first so the marking quality, processing speed, and fixture plan can be confirmed before mass production.
FAQ
Can CNMarking test my own samples before quotation?
Yes. For most marking, cleaning, welding, and precision laser processing projects, sample testing is the safest way to confirm process feasibility. A short video, test photos, and recommended configuration can be prepared after the workpiece and target result are confirmed.
What information should I send for a faster recommendation?
Please send the material, dimensions, required content, target cycle time, production environment, and any automation requirements. If the project is replacing an existing process, also share the current pain point, such as low efficiency, unstable quality, consumable cost, surface damage, or traceability requirements.
Need a similar solution? Contact CNMarking with your workpiece photos and target result. Our engineers can recommend a standard model or a customized workstation based on your sample and production requirements.
