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Increased Conversion Efficiency at 800 W Continuous Wave Output From Single 1-cm Diode Laser Bars at 940 nm

P. Crump1, A. Meissner-Schenk2, T. Kaul2, S. Strohmaier2, M.M. Karow1, A. Boni1, A. Maaßdorf1, D. Martin1 and G. Tränkle1

Published in:

Conf. on Lasers and Electro-Optics/Europe and European Quantum Electronics Conf. (CLEO/Europe-EQEC 2021), Munich, Germany, Jun. 21-25, virtual event, ISBN: 978-1-6654-1876-8, cb-2-1 (2021).


Diode lasers are key sources of optical energy for industrial machine tools and continuous improvement in their performance is needed to support performance and cost scaling efforts. For example, disk lasers as used in laser tools for metal cutting are typically pumped in continuous wave (CW) mode by 1-cm wide diode laser bars with an operating wavelength around λ = 940 nm, and ongoing increases in optical power per bar Popt are needed. Specifically, power scaling is needed above the current CW commercial level of around Popt = 300 W per bar [1] . Bars with performance at Popt = 1 kW and above have been demonstrated in research studies for many years (e.g. [2] ), with most work focussing on bar optimization for pulsed operation (ns-ms) as recently reviewed in [3] .

1 Ferdinand-Braun-Institut gGmbH, Leibniz Institut für Höchstfrequenztechnik, Gustav-Kirchhoff-Straße 4, 12489 Berlin, Germany
2 TRUMPF Laser GmbH, Niederlassung Berlin, Berlin, Germany

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