From the 1960s to the 1980s, a variety of nonlinear crystal materials were used for intracavity frequency-doubling Nd: YAG lasers to obtain green light sources. In the 1990s, the all-solid-state green laser with high power and high repetition frequency, which has the advantages of long life, high reliability, small size and high efficiency, has been developed unprecedensively. With the improvement of the quality of domestic semiconductor lasers and the reduction of the price of foreign semiconductor lasers, the research of domestic all-solid-state high-power green lasers has also made great progress.
In 2021, TRUMPF Germany launched its 3 kW high-power continuous green disc laser. It is reported that the average output power of the product is up to 3 kilowatts, representing the strongest power in the current green laser series, very suitable for welding of high inverse materials such as copper and aluminum, especially in the lithium battery industry represented by new energy vehicle power batteries. TRUMPF green laser (1000-3000W) can achieve up to 120 layers of copper foil welding, almost no splash. Precise and penetration are controllable. In addition, high-power green light also has outstanding advantages in additive manufacturing of pure copper materials -3D printing applications.
According to the research results given by the German Institute of Photon Technology, at room temperature 20℃, when copper is in a solid state, the absorption rate of the green band is about 40%. When the temperature rises to 1600 ° C and copper is in a molten state, the absorption rate decreases by about 5%. That is, the absorption of green light by copper melting is slightly reduced. This characteristic helps to obtain stable small holes when processing copper, and can achieve almost zero spatter. This is the obvious advantage of green laser welding over infrared laser welding.
The above research proves that green laser can be used as the best light source for 3D printing of high anti-metal materials, and 3D printing of pure copper materials can solve related problems well and achieve a density greater than 99.95%. In the future, green laser is expected to be applied to 3D printing of pure copper materials, and the market size of 3D printing of pure copper materials is also expected to be further expanded.
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