The "Rainbow Revolution" on Stainless Steel with Infrared Picosecond Laser

Stainless steel is widely used for its excellent corrosion resistance and aesthetic appeal. However, adding personalized colored patterns to its surface has always been a technical challenge. Traditional methods, such as electroplating or painting, often struggle to achieve fine pattern designs, and the colors are prone to fading or peeling, affecting both appearance and durability. Now, with the breakthrough in laser technology, especially the advent of infrared picosecond lasers, this challenge has been perfectly addressed.

The core of this technology lies in the interaction between ultra-short pulse lasers and the material. When an infrared picosecond laser (e.g., 1064nm wavelength) irradiates the stainless steel surface, it generates color through Laser-Induced Periodic Surface Structures (LIPSS) or thin-film interference effects. The principle is similar to the color mechanism of butterfly wings or soap bubbles: the laser forms a transparent oxide thin film on the metal surface, only hundreds of nanometers thick. Light entering this film undergoes interference, and different film thicknesses produce different colors based on the wavelength of light . By precisely controlling parameters such as laser energy, pulse width, and scanning speed, the thickness of the oxide film can be accurately regulated, creating a rich color gradient from gold and blue to red on the metal surface without any dyes or additives .

The infrared picosecond laser launched by ARGUS laser is an outstanding representative of this technology. By precisely controlling the laser parameters, it can instantly modify the surface structure of the stainless steel without damaging the material, thereby producing a rich variety of optical effects. This technology offers high marking precision, and the colors are very durable and stable, as they are directly generated on the material's surface and will not fade or peel. Furthermore, it boasts advantages such as being environmentally friendly (no chemical reagents involved), having micron-level precision (capable of creating fine patterns below 0.1mm), and causing zero damage to the material .

The application scenarios for this technology are extensive. Beyond creating permanent and durable colorful patterns on stainless steel tableware (like chopsticks), it is equally suitable for customizing high-end personalized products such as jewelry, watches, and phone cases. In the medical device field, it is used for color-coding surgical instruments to enhance operational safety . In the aerospace industry, it can be used for part identification . In architectural decoration, it enables the creation of personalized, colorful metal curtain walls . In conclusion, infrared picosecond laser technology is redefining the standards of manufacturing aesthetics, allowing hard metals to bloom with brilliant colors.