26 February 2013 Laser-bar stack using ELF heat-sinks mounted kinematically for double-sided cooling
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Abstract
We present a novel, high-power stack of 20% fill-factor, 976nm, laser-diode bars, each directly attached to an enhanced lateral-flow (ELF), copper-based, water-cooled heat-sink. The heat-sinks contain mounting screws that form a kinematic mount to minimize detrimental mechanical-stress on the diode bars while also providing beneficial, double-side cooling of the bars. A stack of 18-bars, emitting 2.54kW, was constructed to validate the technology. Using standard optics and a polarization multiplexer, a 320μm diameter, 0.3NA focus is achieved with a 6-bar stack that robustly couples 450W, with a ~67% coupling efficiency, from a passive, 400μm, 046NA doubleclad fiber.
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A. K. Chin, A. K. Chin, J. G. Manni, J. G. Manni, R. H. Chin, R. H. Chin, J. Levy, J. Levy, M. Dogan, M. Dogan, J. H. Jacob, J. H. Jacob, R. Pathak, R. Pathak, C. Wessling, C. Wessling, K. D. Lang, K. D. Lang, H. Eppich, H. Eppich, J. Fryer, J. Fryer, T. Haverkamp, T. Haverkamp, } "Laser-bar stack using ELF heat-sinks mounted kinematically for double-sided cooling ", Proc. SPIE 8605, High-Power Diode Laser Technology and Applications XI, 86050P (26 February 2013); doi: 10.1117/12.2002230; https://doi.org/10.1117/12.2002230
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