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15 February 2006 Dense spatial multiplexing enables high brightness multi-kW diode laser systems
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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.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Holger Schlüter, Christoph Tillkorn, Ulrich Bonna, Greg Charache, John Hostetler, Ting Li, Carl Miester, Robert Roff, Thilo Vethake, and 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);

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