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Proceedings Paper

Scalable and modular diode laser architecture for fiber coupling that combines high-power, high-brightness, and low weight
Author(s): Andreas Bayer; Bernd Köhler; Axel Noeske; Matthias Küster; David Irwin; Steve Patterson; Jens Biesenbach
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Paper Abstract

The demand for high-power and high-brightness fiber coupled diode laser devices is mainly driven by applications for solid-state laser pumping and materials processing. The ongoing power scaling of fiber lasers requires scalable fibercoupled diode laser devices with increased power and brightness. In particular, applications and technologies that demand a high degree of mobility, such as airborne or field transportable systems, also require a robust and extremely lightweight design. We have developed a scalable and modular diode laser architecture that combines high-power, high-brightness, and low weight that fulfills these requirements for a multitude of applications. At the heart of the concept is a specially tailored diode laser bar with an epitaxial and lateral structure designed such that only standard fast- and slow-axis collimator lenses are required to couple the beam into a 200μm core fiber with a numerical aperture (NA) of 0.22. To fulfill the requirements of scalability and modularity, a reduced size heat sink populated with multiple tailored bars is used. This enables a compact and lightweight design with minimum beam path length. The design concept is capable of providing single wavelength, high-power laser diode modules, with optional volume holographic gratings for wavelength stabilization. Modules with output power levels of more than one kW at a power-to-weight ratio of less than 1 kg/kW are achievable. In this paper, two laser modules based on this concept are presented. The optical output power is above 500W at a module weight less than 500g and 300W at 300g. Both modules are coupled into a 200μm, 0.22NA fiber.

Paper Details

Date Published: 7 March 2014
PDF: 6 pages
Proc. SPIE 8965, High-Power Diode Laser Technology and Applications XII, 89650J (7 March 2014); doi: 10.1117/12.2038959
Show Author Affiliations
Andreas Bayer, DILAS Diodenlaser GmbH (Germany)
Bernd Köhler, DILAS Diodenlaser GmbH (Germany)
Axel Noeske, DILAS Diodenlaser GmbH (Germany)
Matthias Küster, DILAS Diodenlaser GmbH (Germany)
David Irwin, DILAS Diodenlaser GmbH (Germany)
Steve Patterson, DILAS Diodenlaser GmbH (Germany)
Jens Biesenbach, DILAS Diodenlaser GmbH (Germany)

Published in SPIE Proceedings Vol. 8965:
High-Power Diode Laser Technology and Applications XII
Mark S. Zediker, Editor(s)

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