Kilowatt-class high-brightness blue diode laser using actively controlled dense wavelength beam combining technology for material processing

Blue diode lasers exhibit high efficiency in processing highly reflective metal materials, owing to over 60% absorption at wavelengths near 445 nm. Applications such as copper welding and 3D printing demand both high beam quality and high power from blue lasers. Here, we demonstrate a kilowatt-class high-brightness blue semiconductor laser based on Everbright’s patented actively controlled dense wavelength beam combining (DWBC) technology. The laser comprises wavelength-stabilized fiber-coupled modules operating across the 443–453 nm range. All modules are spliced to a fiber array, and the array is then spectrally combined using a dielectric grating. The Beam Parameter Product (BPP) of the combined beam is less than 5 mm·mrad, equivalent to the BPP of a 100 μm/0.1 NA fiber.