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Ultraviolet Laser Application and Development: from Cold to Hot

Aug 13, 2020

1.3D printing and additive manufacturing: The ultraviolet laser under the control of the calculator scans the liquid photosensitive resin point by point and layer by layer using the contour of each layered section of the predetermined part as the track, so that the scanned resin thin layer produces photopolymerization reaction. Curing and molding. The 3D printing industry has developed rapidly in the past two years. The SLA manufacturing process has become more complete, and the increasingly mature printing process has placed higher requirements on the UV laser. As a result, Behring Laser specially launched 0.5-3W air-cooled ultraviolet laser (LP105) for 3D printing and additive manufacturing applications. This laser has a single pulse energy> 5μJ@100kHz, a repetition frequency of 30-100kHz, and a pulse width <70ns@100kHz. The beam quality is high (M2<1.3), and the roundness of the spot is more than 90%. These strict parameter requirements can perfectly solve a series of problems such as insufficient hardness and color difference during the curing process. The air-cooled cooling method makes the laser smaller and smaller. It is easy to integrate the overall light path of 3D printing.

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2.Fine marking: Ultraviolet laser has a wavelength of 355nm, which is a cold light source, which can be better absorbed by materials and is less destructive to materials. It is widely used for fine marking on the surface of plastics, metals, ceramics, glass and other materials. With the increasing demand for industrialization, the application of flying marking has become more popular, and the demand for power is therefore increasing. The LP106 series of Behring lasers with optional power range of 3 to 5W adopts a new frequency doubling module temperature control design, the power output is more stable and the pulse width <15ns@30khz can be applied to more marking materials.

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3.Material cutting: With the increase in the power of UV lasers, the cutting field is more widely used, and it is suitable for materials such as cover film, PCB board, thin metal and silicon wafer. Compared with traditional CNC cutting, laser has the unique flexibility to process various curves and small-angle cutting, which is more efficient and the yield rate of processed products can also be improved. Take the PCB board as an example. The material cladding is copper and aluminum metal. It is processed by two different power ultraviolet lasers of 7W and 10W. The PCB board is cut, and the edge of the section is neat and there is no jagged phenomenon. Both processing effects meet the standard. The 10W power processing is more efficient and more in line with the needs of manufacturing. At the same time, it also means that high-power UV laser equipment will become more and more popular in future cutting applications.

 

The development trend of ultraviolet lasers: As one of the current mainstream industrial lasers, solid-state ultraviolet lasers are also growing. From the first ultraviolet light in the laboratory to the finished laser equipment in the hands of customers, the laser performance is more superior and stable. Longer life, better stability and higher efficiency. Traditional lasers are generally divided into two independent sections, electrical and optical. The software and control parts are integrated inside the electric control box, while the optics are independent inside the laser cavity. There will be inconvenience in the use of connecting lines and space. Take up more space on the device. In the future, industrialized products will only move in the direction of convenience and integration. The same is true for lasers, with smaller volume, lighter weight, integrated circuits and optical paths, higher power, and better stability. Therefore, high-power integrated models have become An unstoppable development trend.