Laser cleaning, laser is a kind of energy beam, which must be a non-contact and environmentally friendly way, and laser cleaning is a high-quality standard in terms of efficiency and cleanliness.
The process of laser cleaning depends on the interaction between the light pulse generated by the laser and the polluted layer, resulting in a photophysical reaction: affected by the intensity of the beam and the short pulse laser.
1.The beam emitted by the laser is absorbed by the surface pollution layer to be treated.
2.The absorption forms a rapidly expanding plasma (highly ionized unstable gas) and generates a shock wave.
3.After the shock wave turns the pollutants into fragments, they are removed.
4.The light pulse width is short enough to avoid the damage of heat accumulation on the treated surface.
5.Experiments show that when there are oxides on the metal surface, plasma will be generated on the metal surface.
Each laser pulse removes a certain thickness of pollution layer. If the contaminated layer is thick, multiple pulses are required for cleaning. The number of pulses required to clean the surface depends on the degree of surface contamination.
Light pulses with an energy density higher than a threshold will remove pollutants until they reach the object material. Because its energy density is lower than the failure threshold of the substrate material, the substrate will not be damaged.The principle is that the width mentioned in point 4 is short enough.
