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Proceedings Paper

High-power high-brightness and low-weight fiber coupled diode laser device
Author(s): Paul Wolf; Bernd Köhler; Karsten Rotter; Susanne Hertsch; Heiko Kissel; Jens Biesenbach
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Paper Abstract

New solid-state laser devices, especially fiber laser systems, require increasingly higher optical pump power provided by fiber-coupled diode laser modules. In particular for defense technology, robust but lightweight high-power diode laser sources with high brightness are needed. We have developed a novel diode laser device combining high power, high brightness, wavelength stabilization and low weight, which becomes more and more important for a multitude of applications. Heart of the device is a specially tailored laser bar, which epitaxial and lateral structure is designed such that only standard fast- and slow-axis collimator lenses are required to couple the beam into a 200 μm fiber with numerical aperture of 0.22. In this paper we present a detailed characterization of the new diode laser device with up to 775 W of optical power coupled into a 200 μm, NA 0.22 fiber. One important feature of the device is a lightweight design due to a special housing optimized for low weight. In addition we present results of a diode laser device with 675 W of optical output power and improved spectral quality, which is ensured over a wide range of temperature and current by means of volume holographic gratings for wavelength stabilization. For this device an overall efficiency of more than 42.5 % has been achieved. Furthermore we present a compact diode laser source with 230 W of optical power coupled into a 200 μm, NA 0.22 fiber. This diode laser device is optimized with regard to highest efficiency and yields an overall electro-optical efficiency of more than 50 %.

Paper Details

Date Published: 21 February 2011
PDF: 8 pages
Proc. SPIE 7918, High-Power Diode Laser Technology and Applications IX, 79180O (21 February 2011); doi: 10.1117/12.875147
Show Author Affiliations
Paul Wolf, DILAS Diodenlaser GmbH (Germany)
Bernd Köhler, DILAS Diodenlaser GmbH (Germany)
Karsten Rotter, DILAS Diodenlaser GmbH (Germany)
Susanne Hertsch, DILAS Diodenlaser GmbH (Germany)
Heiko Kissel, 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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