Processing technology of nanosecond ultraviolet (UV) laser

The linear module takes you to understand the process of glass processing by UV laser marking machine. Ultraviolet laser marking machine, when the laser is used to process the etching and marking process on the glass, a high energy density is required, but if the energy density is too high, cracks and even edge collapse will occur, and the energy density is too low, which will lead to the dots being marked. It sinks or cannot be etched directly on the surface, so it is difficult to process. So let's take a look at the processing technology of UV laser marking machine.

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As far as the editor of the linear module knows, the UV laser marking machine marks on flat glass, which is directly related to the peak power of the laser, the size of the focusing spot, and the speed of the galvanometer. Sometimes the light from a high-power laser is not etched on the glass surface, but passes through directly. This is because the peak power of the laser is not enough, or the energy density is not concentrated enough.

The peak power is affected by the laser crystal, pulse width and frequency. The narrower the pulse width and the lower the frequency, the higher the peak power of the laser. We only need to change the scanning speed of the galvanometer to an appropriate value to get a better processing effect. However, it should be noted that the scanning speed is also affected by the frequency of the laser itself. If the frequency is too low, it will also lead to leakage.

On the contrary, the editor of the linear module has learned that when marking on curved glass, the ultraviolet laser is affected by the curved surface, and the focal depth of the focusing spot and the scanning method of the galvanometer are particularly important to the processing effect, that is, the peak power of the laser is affected. , focusing spot, galvanometer scanning speed, galvanometer scanning mode, spot focal depth and field lens range, etc. When the energy density reaches the standard, we will find that the effect on the glass surface is worse as it goes to the edge, and it cannot even be processed on the surface. The reason is that the depth of focus is too shallow.

Therefore, to analyze the glass processing technology of UV laser marking machine, for the glass material with large amplitude and high hardness such as curved glass, the laser with high quality power of ultraviolet beam and narrow pulse width should be selected, which exceeds the independent research and development of laser. Lasers and galvanometers are more suitable for processing such parts.