Why is 355nm UV Ultraviolet laser not suitable for engraving metal?

Why is the UV laser marking machine not suitable for engraving metal?

At present, the widely used laser marking machine models on the market include fiber laser marking machine, ultraviolet laser marking machine, and CO2 laser marking machine. These three types of models can cover almost all kinds of product marking and packaging applications. Mainstream laser marking equipment.

Due to the different application fields, core components and processing principles, the price of the models is also different. For example, the price of the UV laser marking machine is nearly three times that of the fiber laser marking machine.

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In terms of wavelength, UV lasers have shorter wavelengths than visible light, so they are invisible to the naked eye. Although you cannot see these laser beams, it is these short wavelengths that allow the UV laser to focus, thereby producing fine circuit characteristics while also Positioning accuracy can be maintained.

There is another important factor. In addition to the low temperature of the workpiece, the photons in the ultraviolet light allow the ultraviolet laser to be applied to large-scale PCB circuit board assemblies.

Ultraviolet laser marking machine has high absorption rate when applied to resin and copper, and also has appropriate absorption rate when processing glass. Excimer laser (wavelength 248nm) will obtain good absorption rate when processing these main materials. The differences make UV lasers the choice for a variety of PCB material applications in many industrial fields, ranging from basic circuit boards, circuit wiring, to pocket-sized embedded chips and other processes.

The computer system of the UV laser marking machine goes directly from the computer-aided design data to the processing of the circuit board, which means that there is no need for a middleman in the circuit board production process, coupled with the precise focusing ability of ultraviolet rays, which is also the use of ultraviolet laser marking in the circuit board industry. One of the reasons for the marking machine is that the UV laser marking machine is not suitable for marking metal products because the beam is small, and the effect of the marking is not as good as that of the fiber laser marking machine.