The principle of stainless steel coloring with MOPA laser marking machine

MOPA laser marking machine stainless steel coloring principle: the stainless steel material has a colored oxide or a colorless and transparent oxide film on the surface under the action of laser heat, which presents various colors due to the light film interference effect. The color effect produced by stainless steel is mainly due to the interference effect of the film. Figure 4 is a schematic diagram of thin film interference.

Figure 4 Principle of thin film interference

MOPA laser stainless steel high-purity coloring process

The pulsed laser beam acts on the surface of stainless steel to form a layer (a few hundred nanometers) of translucent oxide film on the metal surface. When light enters the oxide film at a certain angle α, a part of the light is reflected on the contact surface of the air and the oxide layer to form a direct Reflected light, another part of the light is refracted into the translucent oxide layer and then refracted into the air to form refracted light, which interferes with the original reflected light. Due to this interference phenomenon of light, some wavelengths of light are strengthened, and some wavelengths of light are cancelled. , Under the comprehensive formation of different color effects.

Advantages of MOPA laser stainless steel coloring

Compared with traditional coloring methods, MOPA laser coloring has many advantages:

(1) Non-contact processing, no consumables, no need to remove materials, not easy to wipe, and high anti-counterfeiting;

(2) No chemical coloring, environmental protection and pollution-free, to avoid the production of toxic and harmful substances;

(3) The process is simple, the operation is simple, and the product has high added value. It can mark patterns and texts in any color.

Typical case of MOPA laser stainless steel coloring

MOPA laser stainless steel high-purity coloring process