The accepted principles are two kinds:
"Hot working" has a laser beam with a higher energy density (it is a concentrated energy flow) that irradiates the surface of the material being processed. The surface of the material absorbs the laser energy and generates a thermal excitation process in the irradiated area, thereby making the material surface (or The temperature of the coating rises, resulting in metamorphism, melting, ablation, evaporation, and the like.
"Cold processing" (ultraviolet) photons with very high energy loads can break chemical bonds in materials (especially organic materials) or surrounding media, causing non-thermal process damage to the material. This cold working has special significance in laser marking processing because it is not a thermal ablation, but a cold peeling that breaks chemical bonds that does not produce a "heat damage" side effect, and thus does not affect the inner layer and the vicinity of the surface to be machined. Generate heat or thermal deformation and other effects. For example, in the electronics industry, excimer lasers are used to deposit a thin film of a chemical substance on a base material, and a narrow groove is formed in the semiconductor substrate.
Comparison of different marking methods
Compared with ink jet marking, the advantage of laser marking and engraving is that: a wide range of applications, a variety of substances (metal, glass, ceramics, plastics, leather, etc.) can be marked with a permanent high-quality mark. No force on the surface of the workpiece, no mechanical deformation, no corrosion on the surface of the material.
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