1 cm wide diode laser bars emitting in the 9xx nm-range are used as high-power light sources in a variety of industrial and scientific applications, with material processing (e.g. metal cutting and welding) being amongst the largest market segments. Specifically, the diode laser bars are used either directly or as pumps for solid-state and fiber lasers, and continuous improvement in performance is needed. FBH’s ongoing diode laser bar research and technology development has enabled rapid progress, with recent work performed in close cooperation with TRUMPF. Examples include the first demonstration of output power Popt = 2 kW per bar, the first bars with conversion efficiency > 60% at Popt = 1 kW and the first demonstration of 1 kW continuous wave (CW) emission at 25°C.
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