During the decades of development of laser technology, it has been very applicable in the fields of electronics, metals, plastics and other industries, especially in the delicate electronic product market, where various laser marking technologies have been well developed.
At present, with the development of technology, the laser marking machine is gradually divided into hot processing and cold processing according to the market demand. These two technologies are applied in different markets according to the requirements of different materials and marking effects. The hot processing basically has ultra-high peak power, excellent beam quality and small size, which can make the equipment compact and sturdy, mainly used in the depth and surface marking of metal, plastic and other products, It is the best equipment for products and performance in the industry.
Application analysis of different technologies for hot and cold processing of two laser marking machines:.
Thermal processing technology of laser marking machine: the laser beam with high energy density and concentration is used to irradiate on the surface of the processed material (metal, plastic, marking, etc.). The surface of the material absorbs laser energy and generates a thermal excitation process in the irradiation area, which causes the temperature of the material surface (or coating) to rise, resulting in metamorphosis, melting, ablation, evaporation and other phenomena, finally forming a preset marking effect, Because the ideal effect is achieved by using high temperature, it is called thermal processing. Laser marking machines, such as optical fiber and semiconductor, and CO2 laser marking machines.
Cold processing technology of laser marking machine: it is a new high-tech equipment that has emerged in recent years. Photons with high load energy (which are generally called ultraviolet 355nm light sources) can modify materials or surrounding media to the extent that they are damaged by non thermal processes. This process has special significance in laser marking processing, because low temperature is used and the thermal ablation temperature at the bottom of the box is lower, Therefore, there is no "thermal damage" side effect to achieve cold peeling, so there is no heating or thermal deformation on the inner layer of the surface to be processed and the surrounding area. Therefore, this processing form that does not use high-temperature evaporation is called cold processing. This processing technology is also the most advanced laser marking technology at present, such as Green Light and.
Both the hot processing and cold processing technologies of laser marking machine are used to process the surface layer of materials, which can achieve permanent high-quality and fine marking effect for various substances and metals, and adopt a pressureless processing method, which will not damage the processed products. Therefore, the advantages of advanced laser marking technology in electronic, circuit board and other industries are preferred, and it replaces traditional marking equipment.
Laser marking machine system can be divided into continuous laser and pulse laser according to its mode. Compared with continuous laser laser marking machine, pulse laser laser marking machine has a lower threshold condition than the ultraviolet laser marking machine. Under the condition of a certain input pump energy, the pulse laser can output higher pulse energy, Then the laser will output a higher peak value, so the laser, the core component of the laser marking machine, is a super pulse laser.
The laser marking machine using super pulse technology can obtain relatively narrow pulse width with relatively high power without increasing the cost. However, if you want to obtain very high peak power or very narrow pulse width, you must use the laser Q-switching technology of the laser marking machine. Q-switching technology means that when using some method to make the loss factor in the cavity change according to the specified procedure, the optical cavity has a high loss factor at the beginning of pumping, The threshold value for laser generation is increased. Because the threshold value is high, laser oscillation cannot be generated, so the number of particles in the metastable state can be accumulated to the level of. Then the cavity loss is suddenly reduced at an appropriate time, and the threshold value is also reduced. Sometimes the number of inversion particles greatly exceeds the threshold value, and the stimulated radiation is rapidly enhanced. Therefore, in a very short time, the energy transformation of particles stored in the upper level will result in laser energy, Forming a very strong laser giant pulse output.
The super pulse laser marking machine has narrow laser output pulse width and high peak power. It has advantages in processing materials with high threshold requirements and less thermal diffusion requirements. Compared with the IC full-automatic laser marking machine, such as glass, leather, ceramics, etc., the thermal processing used by the laser marking machine refers to the process of causing rapid heating when the laser beam irradiates the surface of the object, changing the characteristics of the object or melting and evaporating the material by heat, In the process of laser marking machine processing, the laser energy acting on the material must be greater than the energy required to damage the material, which is greater than the material damage threshold.