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Beam shaping and fibre coupling of high-power diode laser arrays

: Du, K.; Baumann, M.; Loosen, P.; Poprawe, R.; Treusch, H.G.

Beckmann, L.H.J.F. ; European Optical Society -EOS-:
Lasers in material processing
Bellingham, Wash.: SPIE, 1997 (Europto series)
ISBN: 0-8194-2517-6
pp.639-644 : Ill., Lit.
Conference on Lasers in Material Processing <1997, München>
Conference Paper
Fraunhofer ILT ()
diode laser array; fibre-optic component; laser beam shaping; material processing; micro optics; optical system design; solid-state laser pumping

A technique for coupling the radiation of a high-power diode laser bar into one multimode fibre with high efficiency, easy alignment requirements and low manufacturing costs is demonstrated using a single fibre with 400 mu m core diameter. The principal item of the fibre-coupling system is a pair of micro step-mirrors - a novel design for beam shaping. The overall efficiency from diode-laser to fibre is 71 per cent with 20 W cw laser power through the fibre. Polarisation and wavelength multiplexing renders the system scaleable to higher output power which makes it highly suitable for material processing and pumping of lasers.