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The principle of laser cleaning technology

The principle of laser cleaning technology

Laser cleaning technology is a successful application of laser technology in the engineering field. Its basic principle is to use the high energy density of laser to interact with the contaminants attached to the workpiece base to cause instantaneous thermal expansion, melting, gas volatilization, etc. The form is separated from the workpiece base. Laser cleaning technology has the characteristics of high efficiency, environmental protection and energy saving, and has been successfully used in tire mold cleaning, aircraft body paint removal, cultural relic restoration and other fields.

The emergence of laser cleaning technology is a revolution in cleaning technology. Laser cleaning technology takes advantage of the advantages of laser such as high energy density, high precision, and efficient conduction. Compared with traditional cleaning technology, it has obvious advantages in cleaning efficiency, cleaning accuracy, cleaning location, etc., and can effectively avoid the problems caused by cleaning technologies such as chemical corrosion cleaning. environmental pollution and will not cause damage to the substrate.

So what is laser cleaning? Laser cleaning is the process of removing material from solid (or sometimes liquid) surfaces through exposure to a laser beam. At low laser fluence, the material is heated by the absorbed laser energy and evaporates or sublimes. At high laser fluence, the material is often converted into a plasma. Typically, laser cleaning involves removing material with a pulsed laser, but if the laser intensity is high enough, a continuous wave laser beam can be used to ablate material. Deep ultraviolet excimer lasers are mainly used for photoablation. The laser wavelength used for photoablation is approximately 200nm. The depth to which laser energy is absorbed and the amount of material removed by a single laser pulse depends on the optical properties of the material as well as the laser wavelength and pulse length. The total mass ablated from the target per laser pulse is often referred to as the ablation rate. Laser radiation characteristics such as laser beam scanning speed and scan line coverage can significantly affect the ablation process.

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