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Proceedings Paper

Tailored bars at 976 nm for high-brightness fiber-coupled modules
Author(s): Heiko Kissel; Paul Wolf; Alexander Bachmann; Christian Lauer; Harald König; Jens W. Tomm; Bernd Köhler; Uwe Strauß; Jens Biesenbach
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Paper Abstract

In 2007, DILAS proposed the approach to tailor the output beam characteristics of laser diodes to match the required beam quality of a desired target fiber, thus, drastically simplifying the coupling optics to basically only fast and slow axis collimation lenses. Over the last years, we developed and improved this tailored bar (T-Bar) concept together with the tooling for fully automated mass production of fiber-coupled T-Bar modules for fiber laser pumping as well as for direct applications.

We present results on the improvement of T-Bars tailored for optimized coupling into fibers with a diameter of 200 μm with NA 0.22 corresponding to a beam parameter product of 22 mm·mrad. Cost efficient coupling to this fiber requires a tailored beam parameter product smaller than 15.5 mm·mrad in slow axis direction corresponding to a slow axis beam divergence of 7° (full angle, 95% power content) for five 100 μm wide emitters. The improved T-Bars fulfil this requirement up to an output power of 52 W with a brightness of 3.1 W/mm·mrad and a power conversion efficiency achieving 69%. This progress in the T-Bar performance together with modifications in the module design led to the increase of the reliable output power from 135 W in 2009 to 360 W in 2017 for a T-Bar module with one baseplate. We will also give a review of the main development steps and further R and D improvements.

Paper Details

Date Published: 22 February 2017
PDF: 12 pages
Proc. SPIE 10086, High-Power Diode Laser Technology XV, 100860B (22 February 2017); doi: 10.1117/12.2253856
Show Author Affiliations
Heiko Kissel, DILAS Diodenlaser GmbH (Germany)
Paul Wolf, DILAS Diodenlaser GmbH (Germany)
Alexander Bachmann, OSRAM Opto Semiconductors GmbH (Germany)
Christian Lauer, OSRAM Opto Semiconductors GmbH (Germany)
Harald König, OSRAM Opto Semiconductors GmbH (Germany)
Jens W. Tomm, Max-Born-Institut für Nichtlineare Optik und Kurzzeitspektroskopie (Germany)
Bernd Köhler, DILAS Diodenlaser GmbH (Germany)
Uwe Strauß, OSRAM Opto Semiconductors GmbH (Germany)
Jens Biesenbach, DILAS Diodenlaser GmbH (Germany)

Published in SPIE Proceedings Vol. 10086:
High-Power Diode Laser Technology XV
Mark S. Zediker, Editor(s)

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