Laser processing is a very important high-energy beam processing method, which has the characteristics of strong laser directionality, high brightness, good monochromaticity, and good coherence.
The principle of laser processing technology is that the laser emitted by the laser generator is converted and focused by the lens to obtain a columnar or ribbon beam with a high degree of parallelism, and a very high energy density is obtained. After absorbing the energy of laser irradiation, the material heats up rapidly in a very short time, and will be melted, ablated or even vaporized by a series of physical or chemical changes according to the properties of the processed material.
With the continuous absorption of laser energy, the metal vapor in the pit of the processing material expands rapidly, and the corresponding pressure also suddenly increases, resulting in high-speed ejection of explosive melt, forming a highly directional shock wave inside the processing material ( Thermal stress), so as to achieve the purpose of removing, connecting, modifying and separating, and changing the properties of materials.
It is the combined effect of the high temperature melting of the processing material and the shock wave thrown under the photothermal effect. A comprehensive process of shock waves being thrown.
The process can be divided into four stages of physical description through the interaction between laser and processing material, laser absorption by processing material, heating of processing material, melting and vaporization of processing material, and laser plasma shielding phenomenon.