For a long time, highly reflective materials such as copper, aluminum, and gold have been widely used in high-end manufacturing sectors, including new energy vehicles (NEVs), energy storage equipment, AI computing heat dissipation, and aerospace. However, traditional infrared lasers (with a wavelength of approx. 1070nm) face severe physical bottlenecks when processing these materials. Taking pure copper as an example, its absorption rate for infrared laser is only about 5%. This means over 95% of the energy is reflected, resulting in low processing efficiency and easily triggering defects such as welding spatter, porosity, and micro-cracks. Even worse, the back-reflected light can burn the core optical components of the laser.
Recently, several top domestic laser enterprises (such as Lanmu Laser, Vivlaser, and Hiprean) have announced major breakthroughs in the field of high-power blue lasers, successfully achieving the mass production of kilowatt-class and even 10kW-class blue lasers. The core of this technological breakthrough lies in its physical wavelength advantage: blue light (with a wavelength of approx. 450nm) has an absorption rate of up to 65% for copper, which is more than 13 times higher than that of infrared lasers. This extremely high energy coupling efficiency allows blue light to achieve a stable molten pool at the initial stage of processing, fundamentally eliminating spatter and porosity from a physical perspective. The resulting welds are dense and smooth, with the yield rate increasing to over 97%.
In practical industrial applications, domestic blue lasers have demonstrated powerful empowering effects. In the NEV sector, this technology has been successfully applied to the precision welding of power battery tabs, busbars, and flat-wire motors, significantly enhancing battery safety and electrical conductivity. In the AI computing infrastructure sector, for the processing of AI chip liquid-cooled copper heat sinks, blue lasers have not only reduced welding energy consumption by over 90% but also solved the issues of large heat-affected zones and insufficient precision caused by traditional processes, providing crucial support for the stable operation of computing infrastructure. Furthermore, blue light technology has also shown excellent performance in the precision processing of precious metals like gold and the joining of dissimilar metals (e.g., copper-aluminum, copper-stainless steel).
Currently, domestic enterprises have built a full-power product matrix for blue lasers ranging from hundreds of watts to 10kW, and have innovatively introduced "blue + infrared" composite welding solutions. This solution utilizes blue light to preheat and stabilize the molten pool, combined with infrared lasers for highly efficient deep-penetration welding, perfectly adapting to complex working conditions. With the full localization of core technologies, the manufacturing costs of high-power blue lasers are dropping significantly. They are accelerating the replacement of traditional light sources, leading global high-end precision manufacturing into a new era characterized by "zero defects, low energy consumption, and high yield rates."
