The blue diode laser revolutionizes the processing of copper, gold, and other highly reflective metals in several ways. The direct generation of up to 6 kW (cw) laser power in the 445 nm wavelength range is unique for industrial lasers. This technology avoids complex and inefficient wavelength conversions. Up to 6 kW laser power supports both controlled heat conduction welding and keyhole welding processes, offering a wide range of application opportunities.