Laser-bar stack using ELF heat-sinks mounted kinematically for double-sided cooling

A. K. Chin; J. G. Manni; R. H. Chin; J. Levy; M. Dogan; J. H. Jacob; R. Pathak; C. Wessling; K. D. Lang; H. Eppich; J. Fryer; T. Haverkamp

doi:10.1117/12.2002230

26 February 2013 Laser-bar stack using ELF heat-sinks mounted kinematically for double-sided cooling

A. K. Chin, J. G. Manni, R. H. Chin, J. Levy, M. Dogan, J. H. Jacob, R. Pathak, C. Wessling, K. D. Lang, H. Eppich, J. Fryer, T. Haverkamp

Author Affiliations +

Proceedings Volume 8605, High-Power Diode Laser Technology and Applications XI; 86050P (2013) https://doi.org/10.1117/12.2002230
Event: SPIE LASE, 2013, San Francisco, California, United States

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, J. G. Manni, R. H. Chin, J. Levy, M. Dogan, J. H. Jacob, R. Pathak, C. Wessling, K. D. Lang, H. Eppich, J. Fryer, and 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); https://doi.org/10.1117/12.2002230

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