70% efficient near 1kW single 1-cm laser-diode bar at 20°C

M. T. Knapczyk; J. H. Jacob; H. Eppich; A. K. Chin; K. D. Lang; J. T. Vignati; R. H. Chin

doi:10.1117/12.873179

21 February 2011 70% efficient near 1kW single 1-cm laser-diode bar at 20°C

M. T. Knapczyk, J. H. Jacob, H. Eppich, A. K. Chin, K. D. Lang, J. T. Vignati, R. H. Chin

Proceedings Volume 7918, High-Power Diode Laser Technology and Applications IX; 79180F (2011) https://doi.org/10.1117/12.873179
Event: SPIE LASE, 2011, San Francisco, California, United States

Abstract

A record, 940W, CW output-power has been achieved for a single, 1cm-wide, 5mm cavity-length, 77% fill-factor, 940nm, laser-diode bar operated at 900A and 20°C heat-sink temperature. The slope efficiency below 400A is 1.2W/A and the peak power-conversion efficiency is 70%. The laser bar was attached to a novel EPIC (Enhanced Performance Impingement Cooler) heat-sink which has a heat removal capacity exceeding 3kW/cm². Constant current operation at 580A (~600W), 20°C over a period of 100hrs was also demonstrated. These record results are, in large part, due to the record low thermal resistance of 0.060K/W, about a third that of micro-channel coolers.

Citation Download Citation

M. T. Knapczyk, J. H. Jacob, H. Eppich, A. K. Chin, K. D. Lang, J. T. Vignati, and R. H. Chin "70% efficient near 1kW single 1-cm laser-diode bar at 20°C", Proc. SPIE 7918, High-Power Diode Laser Technology and Applications IX, 79180F (21 February 2011); https://doi.org/10.1117/12.873179

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