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kW-class direct diode laser for sheet metal cutting based on commercial pump modules

: Witte, U.; Schneider, F.; Holly, C.; Meo, A. di; Rubel, D.; Boergmann, F.; Traub, M.; Hoffmann, D.; Drovs, S.; Brand, T.; Unger, A.


Zediker, M.S. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
High-Power Diode Laser Technology XV : 30-31 January 2017, San Francisco, California, United States
Bellingham, WA: SPIE, 2017 (Proceedings of SPIE 10086)
ISBN: 978-1-5106-0613-5
ISBN: 978-1-5106-0614-2
Paper 1008608, 13 S.
Conference "High-Power Diode Laser Technology" <15, 2017, San Francisco/Calif.>
Fraunhofer ILT ()

We present a direct diode laser with an optical output power of more than 800 W ex 100 μm with an NA of 0.17. The system is based on 6 commercial pump modules that are wavelength stabilized by use of VBGs. Dielectric filters are used for coarse and dense wavelength multiplexing. Metal sheet cutting tests were performed in order to prove system performance and reliability. Based on a detailed analysis of loss mechanisms, we show that the design can be easily scaled to output powers in the range of 2 kW and to an optical efficiency of 80%.