Laserline increases beam quality of blue diode lasers

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Blue diode lasers can be used to weld copper hair pins in e-mobility production. (Image: Laserline)

Diode laser manufacturer Laserline has optimised its 450nm wavelength LDMblue high-power diode laser portfolio.

Primarily developed for copper material processing in the electronics industry, these blue diode lasers are now available in six power levels between 300 and 2,000W.

In addition, important advances have been made in terms of focusing properties.

With the LDMblue 300-20 and LDMblue 800-20, a beam quality of 20mm-mrad is now available at output powers of up to 800W. For the 1,500W systems, the beam parameter product has been reduced from the previous 60 to 30mm-mrad.

As a result, the LDMblue 1500-30 offers an improved beam quality by a factor of two at identical power. Besides, blue diode lasers with output powers of 500, 1,800 and 2,000W with a beam parameter product of 60mm-mrad are now available for applications with medium-to-high power requirements (LDMblue 500-60, 1800-60 and 2000-60).

The advances in beam quality are especially significant for joining applications related to electrical conductor technology. Due to the smaller focus diameter, extremely thin and highly filigreed copper contacts can be precisely machined. As a result, very narrow joining seams are realised.

Learn more about blue diode laser processing

The improved beam quality enables greater working distances and simplifies scanner welding applications. Further advantages may be obtained by combining with the finely graduated power regulation of the Laserline laser systems.

Critical energy input into seam-adjacent component zones is avoided, while exceptionally calm melt pools are created. This allows workpiece surfaces to be melted without major spatter formation. The cooled seams are smooth and virtually pore-free, which further impresses with high stability and excellent electrical conductivity.

Laserline's LDMblue blue diode lasers are now available in six power levels between 300 and 2,000W. (Image: Laserline)

In electronics manufacturing, blue diode lasers are now considered a key technology. They have opened up a wide range of new options for processing conductor materials in the non-ferrous metal sector. Light in the blue wavelength spectrum is absorbed by non-ferrous metals up to 20 times the capacity of infrared light. A lot less energy is therefore required to melt component surfaces compared to conventional infrared lasers.

For the very first time, these blue diode lasers have made a controlled heat conduction welding process possible. Highly conductive non-ferrous metals such as copper and gold can now be joined with ease. Even the thinnest copper components can now be welded without artificial material reinforcement.

LDMblue diode lasers have also been successfully used in non-ferrous metal-based coating processes and currently, they are also being tested in maritime applications and high-power lighting technology.

In the long term, output powers of up to 5kW may be considered realistic.