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Proceedings Paper

Fiber-coupled high-brightness high-power diode laser for solid-state laser pumping and material processing
Author(s): Bodo Ehlers; Stefan Heinemann; Falk Doerfel
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Paper Abstract

Two applications emerge as drivers for higher brightness fiber-coupled diode lasers: advanced solid-state pumping schemes and materials processing. In contrast to the well-established side-pumping schemes of laser rods, advanced pumping schemes for today's solid-state lasers make use of the high brightness of the pump sources to increase the performance and efficiency of the solid-state laser. Materials processing applications such as metal welding and cutting are commonly served with solid-state lasers or CO2 lasers. Lately, the increased lifespan, reduced systems costs and increased brightness of fiber-coupled diode laser systems make them a new alternative. In this work, a diode laser system is described that yields 250 wats in a 600 micrometer spot with a numerical aperture 0.2 of the focused beam, corresponding to a F/# of 2.4. The system is based on a single 15 bar stack that operates in cw-mode. For brightness enhancement, it incorporates a measure to increase the fill factor of the emitting aperture and polarization multiplexing. The brightness in the focus spot is 105W/cm2 with a F# of 2.4 focusing optic and 3x105W/cm2 with a high speed of F/# of 1.4. To achieve the required symmetry for fiber coupling, the system incorporates a beam transformer that assimilates the beam quality along the two main axes of the beam profile. A monolithic design is chosen to reduce alignment tolerances and to increase ruggedness.

Paper Details

Date Published: 19 June 2003
PDF: 7 pages
Proc. SPIE 4973, High-Power Diode Laser Technology and Applications, (19 June 2003); doi: 10.1117/12.478369
Show Author Affiliations
Bodo Ehlers, Fraunhofer USA (United States)
Stefan Heinemann, Fraunhofer USA (United States)
Falk Doerfel, Fraunhofer USA (United States)

Published in SPIE Proceedings Vol. 4973:
High-Power Diode Laser Technology and Applications
Mark S. Zediker, Editor(s)

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