Laser marking machine technology and Q-switching technology analysis

Author: Correct Pack -Laser Marking Machine Manufacturer

In the decades of development of laser technology, it has been very suitable for applications in electronics, metals, plastics and other industries, especially in the delicate and delicate electronic product market, various laser marking technologies have been well applied in this market development of. At present, with the development of technology, laser marking machines are gradually divided into two technologies according to market demand: thermal processing and cold processing. These two technologies are applied in different markets according to different materials and marking effect requirements. Thermal processing basically has ultra-high peak power, excellent beam quality and small size, which can make the equipment compact and strong. It is mainly used in the depth and surface marking of metals, plastics and other products. It belongs to the industry's product and performance best equipment. Analysis of different technical applications of thermal processing and cold processing of two laser marking machines:.

Laser marking machine thermal processing technology: use a concentrated laser beam with high energy density to irradiate the surface of the material to be processed (metal, plastic, marking, etc.), the surface of the material absorbs the laser energy, and generates heat in the irradiated area The excitation process, so that the temperature of the material surface (or coating) rises, resulting in metamorphosis, melting, ablation, evaporation and other phenomena, and finally forms the preset marking effect. Because it uses high temperature to achieve the ideal effect, it is called thermal processing, laser marking Marking machines such as: optical fiber and semiconductor and co2 laser marking machine. Laser marking machine cold processing technology: It is a high-tech equipment that has only appeared in recent years. It uses photons with high load energy (the photons are generally referred to as ultraviolet 355nm light sources), which can modify the material or the surrounding medium. , to cause non-thermal process damage to the material, this kind of processing has special significance in laser marking processing, because the low temperature is used, and the thermal ablation temperature at the bottom of the box is lower, so there is no“heat damage”The side effect is cold peeling, so there is no heating or thermal deformation on the inner layer and nearby areas of the processed surface. Therefore, this processing form that does not use high-temperature evaporation is called cold processing. The processing technology is also the most advanced laser printing at present. Standard technologies like: Greenlight and . Whether it is laser marking machine thermal processing or cold processing technology is the processing of the surface layer of the material, it can achieve permanent high-quality and fine marking effects for various substances and metals, and adopts a stress-free processing method, not to mention It will cause damage to the processed products, so the advantages of advanced laser marking technology in electronics, circuit boards and other industries are given priority and replaced traditional marking equipment.

The laser marking machine system can be divided into two categories: continuous laser and pulse laser according to its method. Compared with the continuous laser marking machine, the pulse laser marking machine has a lower threshold condition. In the case of a certain input pump energy, the pulsed laser can output higher pulse energy. If it is excited by a pulse with a larger pump energy than the original, then the laser will output a higher peak value. In this way, the core components of the laser marking machine The laser is an ultrapulse laser. The laser marking machine using ultra-pulse technology can obtain relatively high power and relatively narrow pulse width without increasing the cost, but laser marking must be used to obtain very high peak power or very narrow pulse width Machine laser Q-switching technology, Q-switching technology refers to the use of a certain method to make the loss factor in the cavity change according to the specified program. , due to the high threshold, laser oscillation cannot be generated, so the number of particles in the metastable state can accumulate to a certain level, and then the loss in the cavity is suddenly reduced at an appropriate moment, and the threshold is also lowered accordingly, and the number of reversed particles is greatly reduced When the threshold value is exceeded, the stimulated radiation is rapidly enhanced, so in a very short time, the energy conversion of the particles stored in the upper energy level will convert the laser energy, forming a very strong laser giant pulse output. The ultra-pulse laser marking machine has the characteristics of narrow laser output pulse width and high peak power. It is advantageous for processing materials with high threshold requirements and less thermal diffusion requirements. Compared with IC automatic laser marking machines such as glass, leather, ceramics, etc. , The thermal processing adopted by the laser marking machine refers to the process in which when the laser beam is irradiated on the surface of the object, it causes rapid heating, and the heat changes the characteristics of the object or melts and evaporates the material. During the processing of the laser marking machine, it acts on the material The laser energy must be greater than the energy required to destroy the material, that is, greater than the material's destruction threshold.

Due to the high damage threshold of glass, leather, ceramics and other materials, and for glass, the energy converted into heat absorption is not uniformly conducted in the glass, which will generate thermal stress and make the glass burst. For leather, the energy of heat conduction The edge of leather processing is burnt. For ceramics, the outermost layer of ceramics is a layer of enamel, which is equivalent to glass in performance. Therefore, these materials must use laser marking machines that work in ultra-pulse mode. When the laser beam of the laser marking machine is projected on the surface of the material, part of the energy is reflected, part is absorbed, and part is transmitted. The specific situation depends on the type of material and the wavelength of the laser marking machine. Among the light energy reaching the surface of the material, The part of the energy absorbed by the material is useful for material processing. The light energy is absorbed in the form of vibration excitation of electrons and atoms, and converted into heat energy, which diffuses to adjacent atoms. As the laser marking machine operates, the absorbed photons become more and more More, the temperature of the material continues to rise, thereby increasing the proportion of light energy absorbed. Zhuhai Correct Pack is a well-known laser equipment manufacturer in China. It has been focusing on the development and production of laser equipment for 12 years, providing customers with a complete set of laser equipment solutions, and creating cost-effective laser equipment. Main business: UV, co2, fiber laser marking machines, laser radium engraving machines And other cost-effective laser equipment, national service hotline: 400-0098-266https://www.xmslaser.com/.