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Proceedings Paper

Enhanced fiber coupled laser power and brightness for defense applications through tailored diode and thermal design
Author(s): Steve Patterson; Tobias Koenning; Bernd Köhler; Sandra Ahlert; Andreas Bayer; Heiko Kissel; Holger Müntz; Axel Noeske; Karsten Rotter; Armin Segref; Michael Stoiber; Andreas Unger; Paul Wolf; Jens Biesenbach
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Paper Abstract

Advances in both diode laser design and packaging technology, particularly thermal management, are needed to enhance the brightness of fiber coupled diode lasers while maintaining the small size and light weight required for defense applications. The principles of design for high efficiency fiber coupling are briefly covered. Examples are provided of fielded and demonstrated 100 and 200 micron diameter fiber coupled packages ranging in output from a few hundred to kW-class units in fibers, to include sub-kg/kW capabilities. The demand for high-power and high-brightness fiber coupled diode laser devices is mainly driven by applications for solid-state and fiber laser pumping. The ongoing power scaling of fiber lasers requires scalable fiber-coupled diode laser devices with increased power and brightness. A modular diode laser concept combining high power, high brightness, wavelength stabilization and low weight, which is considerable concern in the SWaP trades needed to field defense systems, has been developed. In particular the defense technology requires robust but lightweight high-power diode laser sources in combination with high brightness. The heart of the concept is a specially tailored diode laser bar, with the epitaxial and lateral structures designed such that only standard fast- and slow-axis collimator lenses in combination with appropriate focusing optics are required to couple the beam into a fiber with a core diameter of 200 μm and a numerical aperture (NA) of 0.22. The spectral quality, which is an important issue especially for fiber laser pump sources, is ensured by means of Volume Holographic Gratings (VHG) for wavelength stabilization. This paper presents a detailed characterization of different diode laser sources based on the scalable modular concept. The optical output power is scaled from 180 W coupled into a 100 μm NA 0.22 fiber up to 800W coupled into a 400 μm NA 0.22 fiber. In addition we present a lightweight laser unit with an output power of more than 300 W for a 200 μm NA 0.22 fiber with a weight vs. power ratio of only 0.9 kg/kW.

Paper Details

Date Published: 7 May 2012
PDF: 10 pages
Proc. SPIE 8381, Laser Technology for Defense and Security VIII, 83810L (7 May 2012); doi: 10.1117/12.922867
Show Author Affiliations
Steve Patterson, DILAS Diode Laser, Inc. (United States)
Tobias Koenning, DILAS Diode Laser, Inc. (United States)
Bernd Köhler, DILAS Diodenlaser GmbH (Germany)
Sandra Ahlert, DILAS Diodenlaser GmbH (Germany)
Andreas Bayer, DILAS Diodenlaser GmbH (Germany)
Heiko Kissel, DILAS Diodenlaser GmbH (Germany)
Holger Müntz, DILAS Diodenlaser GmbH (Germany)
Axel Noeske, DILAS Diodenlaser GmbH (Germany)
Karsten Rotter, DILAS Diodenlaser GmbH (Germany)
Armin Segref, DILAS Diodenlaser GmbH (Germany)
Michael Stoiber, DILAS Diodenlaser GmbH (Germany)
Andreas Unger, DILAS Diodenlaser GmbH (Germany)
Paul Wolf, DILAS Diodenlaser GmbH (Germany)
Jens Biesenbach, DILAS Diodenlaser GmbH (Germany)

Published in SPIE Proceedings Vol. 8381:
Laser Technology for Defense and Security VIII
Mark Dubinskii; Stephen G. Post, Editor(s)

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