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The cleaning principle of 100W series laser cleaning machine is to use the difference of laser absorption coefficient of cleaning substrate and pollutants to a certain wavelength, or there is a certain difference between the melting point and boiling point temperature of the two. After the pollutants absorb the laser energy, the pollutants vaporize, vibrate and expand instantly, and finally peel off the surface of the substrate, so as to achieve the purpose of cleaning.