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Proceedings Paper

New approach for high-power diode laser modules with homogenized intensity distribution
Author(s): Bernd Köhler; Florian Ahnepohl; Karsten Rotter; Jens Biesenbach
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Paper Abstract

In the last few years high-power diode laser modules with homogenized intensity distribution have found a growing number of applications, like annealing, hardening and surface illumination. The standard beam shaping concepts in such modules are using an optical waveguide or microoptical lens arrays for homogenization. For the generation of long lines with high aspect ratio these concepts have some significant drawbacks, especially if the line is composed of several submodules with shorter line segments. The homogeneity in the transition zone of these segments is always difficult to handle. In this paper we report on a new approach for homogenization of high-power diode laser modules by using linearly arranged fiber bundles to generate homogeneous lines. The main advantage of this concept is that scaling of line length is easily achieved by increasing the number of linearly arranged fibers. We present a detailed characterization of such a modular diode laser system with 3 kW output power and homogenization by means of a fiber bundle. The dimension of the homogenized line is 150 mm x 2.5 mm. In addition we present a number of different diode laser modules with homogenization by means of classical approaches, like microoptical cylindrical lens arrays. The output power of these modules ranges from 50 W to 11 kW with line dimensions from 3 mm x 50 μm up to two dimensional homogenized areas of 55 x 20 mm2.

Paper Details

Date Published: 21 February 2011
PDF: 13 pages
Proc. SPIE 7918, High-Power Diode Laser Technology and Applications IX, 79180U (21 February 2011); doi: 10.1117/12.875065
Show Author Affiliations
Bernd Köhler, DILAS Diodenlaser GmbH (Germany)
Florian Ahnepohl, DILAS Diodenlaser GmbH (Germany)
Karsten Rotter, DILAS Diodenlaser GmbH (Germany)
Jens Biesenbach, DILAS Diodenlaser GmbH (Germany)

Published in SPIE Proceedings Vol. 7918:
High-Power Diode Laser Technology and Applications IX
Mark S. Zediker, Editor(s)

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