What is the principle of laser marking machine?

In fact, these truths are all summed up by the staff from their work! I specifically asked them, Tongfa laser marking is to use a laser beam to make permanent marks on the surfaces of various substances. The function of marking is to expose deep substances through evaporation of surface substances, or to "carve" traces through chemical and physical changes of surface substances caused by light energy, or to display patterns and characters to be etched through burning some substances by light energy.

At present, we recognize two principles:

1 High-energy-density "thermal processing" laser beam (which is a concentrated energy flow) is irradiated on the surface of the processed material, and the surface of the material absorbs the laser energy, resulting in a thermal excitation process in the irradiated area, thus raising the temperature of the surface (or coating) of the material, resulting in metamorphosis, melting, ablation, evaporation and other phenomena.

2 "Cold-working" (ultraviolet) photons with high load energy can destroy the chemical bonds in materials (especially organic materials) or surrounding media, so that materials are damaged by non-thermal processes. This kind of cold working is of special significance in laser marking, because it is not thermal ablation, but does not produce "thermal damage" side effects and interrupt the cold peeling of chemical bonds, so it will not heat or thermally deform the inner layer of the machined surface and its nearby areas. For example, in the electronic industry, excimer lasers are used to deposit chemical thin films on base materials and form narrow grooves on semiconductor substrates.