What Is The Unique Secret Of Each Family To Break The High Reflective Materials？

Laser is considered to be a sharp sword that cuts iron like mud, however, even the sharpest sword will have tricky times, for example, in certain scenarios, there are some materials with high reflectivity, such as silver, copper, etc., known as "high anti-materials". Highly reflective materials have a low absorption rate of laser light, and while they are not easy to process, they can also cause equipment failure or even damage to the equipment. This has been an important threshold that the laser cutting industry has been trying to overcome for many years.
In addition to the low absorption rate, when the high-reflective material is not penetrated, it may cause the return light of higher power to return to the laser, damaging the laser. Therefore, traditionally speaking, laser cutting machines are cautious about processing highly reflective materials.
However, the high anti-materials is a large group, the market application is extremely wide, who can take the lead in conquering the high anti-materials, who will be able to obtain a place in the cruel market. Driven by market demand, in recent years, some laser companies have gradually found ways to break through the barrier of high anti-materials to meet the demand for diversified processing. The following are some of the enterprises' "breakthrough" means:
Blue laser
CO2 lasers emit lasers in the infrared band (usually 10.6um), in many industrial applications with excellent performance, however, in the special band of high-reflective metal processing is not ideal. So one possible idea is to bypass this high reflectivity band and use a shorter wavelength blue laser instead (usually in the 400-500nm range). Processing with a blue laser not only improves the absorption rate, but also improves the splattering problem caused by infrared laser processing.
As a newcomer to the blue laser, compared to the already mature infrared and green lasers, at most a little brother. 2020 September, Guangdong Guangdong, Hong Kong and Macao Bay Area Hard Science and Technology Innovation Research Institute (referred to as the "Institute of hard science and technology") launched a 500w series of semiconductor blue laser, and later launched a series of 1000 w. This series is mainly used for high reflective material processing, the main purpose is to improve the absorption rate, but also to improve the spattering problem caused by the processing of high reflective materials. This series of products are mainly used for welding, cladding and 3D printing of highly antimaterials, which not only fills the domestic blank in this field, but also has a leading position in the world in terms of technology.
Lithium-ion battery welding, electronic components processing and other scenarios, all need to process copper, a common high anti-material. Tested by the Hard Science Institute, the power required to use conventional infrared laser is about 4000 watts, while the blue laser only needs 400-800 watts to realize the processing. At the same time, due to the high absorption rate of copper on the blue light, greatly increasing the process window, can be fine-tuned through the parameter control of the welding effect, to achieve "spatter-free welding". In addition, blue light welding of copper metal also has a large advantage in terms of speed, at least 8 times faster than infrared laser welding.
Optimized fiber output head
In fiber laser machines, there is also the thorny problem of high backlash. In order to solve this problem, Rike Laser chose to start from the laser head.
In principle, the first to bear the brunt of the return laser caused by highly reflective materials is the output cable head. Returned laser light can easily cause the output fiber optic cable to heat up or even be damaged. In order to ensure the safety of the output cable, Ruike laser adopts the new QBH fiber output head, and adds a level of return light stripping device on the basis of the original. This anti-high-reflective design can strip most of the returned laser light in the first time, and combined with the water cooling design, it reduces the thermal impact on the fiber optic cable output head.
In order to verify the performance of the new fiber optic output head, the RFL-A1500D laser equipped with this output head is subjected to high reflection test, the overall test idea is to simulate the user's use of the environment, and even beyond the actual working conditions. After the focus position, 90 ° perpendicular to the copper surface of the harsh welding test, although the copper surface has been in a mirror state, a steady stream of laser light back to the fiber output head, however, the core device has been in the normal operating temperature, not significantly affected by the return of light.
In addition, there is the use of oscillating welding head, composite welding head and other ideas to avoid the problem of high reaction. With the popularization and application of lasers, in materials processing, communications, information processing, medical and cosmetic, scientific research, military and other industrial manufacturing fields come into their own. However, the homogenization of competition is getting more and more intense, open up new ideas, open up a new blue ocean will become the future development trend. With the high anti-materials by the laser "conquered", which will bring new growth points for the laser processing industry.