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Homogenized high power diode laser systems for material processing and illumination

: Traub, M.; Plum, H.-D.; Hoffmann, P.; Loosen, P.; Poprawe, R.

Poprawe, R. ; Wissenschaftliche Gesellschaft Lasertechnik -WLT-:
Lasers in Manufacturing 2003 : Proceedings of the Second International WLT-Conference on Lasers in Manufacturing 2003
München: AT-Verlag, 2003
ISBN: 3-00-011673-7
International Conference on Lasers in Manufacturing <2, 2003, München>
Fraunhofer ILT ()
diode laser system; beam shaping; homogenization; system reliability

Commercially available diode laser bars usually suffer from an intensity distribution not suited for direct applications like hardening, metal and polymer welding, and surface inspection. For these applications, a top hat distribution in one or both directions is demanded. In addition, the reliability is increased by homogenization, since the failure of single emitters influences only the output power but not the shape of the intensity distribution.
Various homogenized diode laser systems developed by Fraunhofer ILT will be presented. The results of the ray tracing simulation performed during the design process will be compared to the measured intensity distribution of the realized modules.