What is laser marking?

Laser marking is the process of permanently marking a surface with a focused laser beam. There are three different types of lasers: fiber lasers, CO2 lasers, and UV lasers. Currently, the three most common laser marking machines on the market are fiber laser marking machines, CO2 laser marking machines, and UV laser marking machines.

1. Fiber laser marking machines:

Using ytterbium-doped fiber as the gain medium, a pump source excites ytterbium ions to generate 1064nm near-infrared laser light. After fiber transmission, galvanometer deflection, and lens focusing, the laser light acts on materials such as metals through a thermal effect (melting/vaporization), achieving high-precision marking.

2. CO2 laser marking machines:

Using a CO2 gas mixture as the medium, electrode discharge excites gas molecules, generating 10600nm mid-infrared laser light. After transmission through a reflector, a galvanometer, and a lens focusing, the laser light acts on organic materials through thermal decomposition/micro-vaporization, achieving marking.

3. UV laser marking machines:

A crystal generates 1064nm laser light, which is then shortened to 355nm ultraviolet light by a frequency-doubling crystal. After focusing through a dedicated optical path, the laser light is cold-processed by photochemical action (breaking molecular bonds), achieving precise marking on sensitive materials without thermal damage. Laser marking can mark a variety of materials, such as stainless steel, carbon steel, aluminum, glass, and crystal.

It can also mark images, text, QR codes, barcodes, QR codes, and number sequences.