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Proceedings Paper

Highly modular high-brightness diode laser system design for a wide application range
Author(s): Haro Fritsche; Bastian Kruschke; Ralf Koch; Fabio Ferrario; Holger Kern; Ullrich Pahl; Einar Ehm; Silke Pflueger; Andreas Grohe; Wolfgang Gries
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Paper Abstract

For an economic production it is important to serve as many applications as possible while keeping the product variations minimal. We present our modular laser design, which is based on single emitters and various combining technics. In a first step we accept a reduction of the very high brightness of the single emitters by vertical stacking. Those emitters can be wavelength stabilized by an external resonator, providing the very same feedback to each of those laser diodes which leads to an output power of about 100W with BPP of <;3.5 mm*mrad (FA) and <5 mm*mrad (SA). Further power scaling is accomplished by polarization and wavelength multiplexing yielding high optical efficiencies of more than 80% and results in about 500 W launched into a 100 μm fiber with 0.15 NA. Subsequently those building blocks can be stacked also by the very same dense spectral combing technique up to multi kW Systems without further reduction of the BPP. These “500W building blocks” are consequently designed in a way that without any system change new wavelengths can be implemented by only exchanging parts but without change of the production process. This design principal offers the option to adapt the wavelength of those blocks to any applications, from UV, visible into the far IR. From laser pumping and scientific applications to materials processing such as cutting and welding of copper aluminum or steel and also medical application. Operating at wavelengths between 900 nm and 1100 nm, these systems are mainly used in cutting and welding, but the technology can also be adapted to other wavelength ranges, such as 793 nm and 1530 nm. Around 1.5 μm the diodes are already successfully used for resonant pumping of Erbium lasers.[1] Furthermore, the fully integrated electronic concept allows addressing further applications, as it is capable of very short μs pulses up to cw mode operation by simple software commands.

Paper Details

Date Published: 1 April 2015
PDF: 7 pages
Proc. SPIE 9348, High-Power Diode Laser Technology and Applications XIII, 93480A (1 April 2015); doi: 10.1117/12.2080123
Show Author Affiliations
Haro Fritsche, DirectPhotonics Industries GmbH (Germany)
Bastian Kruschke, DirectPhotonics Industries GmbH (Germany)
Ralf Koch, DirectPhotonics Industries GmbH (Germany)
Fabio Ferrario, DirectPhotonics Industries GmbH (Germany)
Holger Kern, DirectPhotonics Industries GmbH (Germany)
Ullrich Pahl, DirectPhotonics Industries GmbH (Germany)
Einar Ehm, DirectPhotonics Industries GmbH (Germany)
Silke Pflueger, DirectPhotonics, Inc. (United States)
Andreas Grohe, DirectPhotonics Industries GmbH (Germany)
Wolfgang Gries, DirectPhotonics Industries GmbH (Germany)

Published in SPIE Proceedings Vol. 9348:
High-Power Diode Laser Technology and Applications XIII
Mark S. Zediker, Editor(s)

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