Three cleaning methods of laser cleaning technology

Laser cleaning technology includes three cleaning methods: dry laser cleaning technology, wet laser cleaning technology and laser plasma shock wave technology.

1. Dry laser cleaning refers to the direct irradiation of pulsed laser to clean the workpiece, so that the substrate or surface pollutants absorb energy, and the temperature rises, resulting in thermal expansion or thermal vibration of the substrate, thereby separating the two. The method can be roughly divided into two cases: one is that the surface pollutants absorb the laser to expand; the other is that the substrate absorbs the laser to generate thermal vibration.

2. Wet laser cleaning is to pre-coat a layer of liquid film on the surface before the pulsed laser irradiates the workpiece to be cleaned. Under the action of the laser, the temperature of the liquid film rises rapidly and vaporizes. Gasification instantly generates shock waves that act on pollutant particles. , so that it falls off the substrate. This method requires that the substrate and the liquid film cannot react, so the range of applicable materials is limited.

3. The laser plasma shock wave is a spherical plasma shock wave generated by the breakdown of the air medium during the laser irradiation process. The shock wave acts on the surface of the substrate to be cleaned, releases energy, and removes pollutants; the laser does not act on the substrate, so it will not cause damage to the substrate. Laser plasma shock wave cleaning technology can now clean particle pollutants with a particle size of tens of nanometers, and there is no limit to the laser wavelength.

In actual production, different test methods and related parameters should be selected according to needs to obtain high-quality cleaning workpieces. In the laser cleaning process, surface cleaning efficiency and quality evaluation are important criteria for judging the quality of laser technology log.

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