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22 February 2017 Tailored bars at 976 nm for high-brightness fiber-coupled modules
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Proceedings Volume 10086, High-Power Diode Laser Technology XV; 100860B (2017)
Event: SPIE LASE, 2017, San Francisco, California, United States
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.
Conference Presentation
© (2017) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Heiko Kissel, Paul Wolf, Alexander Bachmann, Christian Lauer, Harald König, Jens W. Tomm, Bernd Köhler, Uwe Strauß, and Jens Biesenbach "Tailored bars at 976 nm for high-brightness fiber-coupled modules", Proc. SPIE 10086, High-Power Diode Laser Technology XV, 100860B (22 February 2017);

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