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21 February 2011 Record CW-brightness from a single 20% fill-factor 1-cm laser-diode bar at 20°C
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Abstract
A record, 250W, CW output-power has been achieved for a single, 1cm-wide, 3.5mm cavity-length, 20% fill-factor, 976nm, laser-diode bar operated at 20°C. The remarkable laser-bar performance was in part the result of a novel EPIC (Enhanced Performance Impingement Cooler) heat-sink with a thermal resistance of 0.16K/W. The superb thermal management resulted in record brightness for a laser bar, i.e. a slow-axis divergence of 10° (95% power containment angle) was achieved at 200W output-power. A coupling efficiency of ~74% into a 200μm core, 0.22NA fiber was achieved.
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A. K. Chin, M. T. Knapczyk, J. H. Jacob, H. Eppich, K. D. Lang, R. H. Chin, and M. Dogan "Record CW-brightness from a single 20% fill-factor 1-cm laser-diode bar at 20°C", Proc. SPIE 7918, High-Power Diode Laser Technology and Applications IX, 79180L (21 February 2011); https://doi.org/10.1117/12.873183
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