15 February 2006 Dense spatial multiplexing enables high brightness multi-kW diode laser systems
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Abstract
The materials processing industry has recently mandated the need for more efficient laser systems with higher beam quality and longer life. Current multiplexing techniques, state-of-the-art laser diodes and novel cooling designs are now emerging as possibilities to meet the ever demanding industry needs. This paper describes the design and initial results of a direct diode system that is aimed at delivering 1.5 kW of output power and a beam divergence of 40 mm mrad on a long life macro-channel cooler. The design entails multiplexing 2 wavelength combined beams and 2 polarization combined beams. Each of the four branches of the direct diode system utilizes a novel stacking and cooling design. The results from one of these branches, 1 wavelength and 1 polarization, are presented where the light is coupled into a fiber with a 400 μm core diameter and a NA of 0.22. Each branch consists of 60 diode laser mini-arrays, where each mini-array consists of four 100 μm wide emitters and a lateral fill factor of 50%. An output power of 500W at 10°C water temperature and 420 W at 25°C are demonstrated through the 400 μm fiber.
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Holger Schlüter, Christoph Tillkorn, Ulrich Bonna, Greg Charache, John Hostetler, Ting Li, Carl Miester, Robert Roff, Thilo Vethake, Claus Schnitzler, "Dense spatial multiplexing enables high brightness multi-kW diode laser systems", Proc. SPIE 6104, High-Power Diode Laser Technology and Applications IV, 61040M (15 February 2006); doi: 10.1117/12.657267; https://doi.org/10.1117/12.657267
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