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Proceedings Paper

Scaling brilliance of high power laser diodes
Author(s): Harald König; Guenther Grönninger; Christian Lauer; Wolfgang Reill; Markus Arzberger; Uwe Strauß; Heiko Kissel; Jens Biesenbach; Arnd Kösters; Joerg Malchus; Volker K. Krause
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Paper Abstract

New direct diode laser systems and fiber lasers require brilliant fiber coupled laser diodes for efficient operation. In the German funded project HEMILAS different laser bar designs are investigated with tailored beam parameter products adapted for efficient fiber coupling. In this paper we demonstrate results on 9xx and 1020nm bars suitable for coupling into 200μm fibers. With special facet technology and optimised epitaxial structure COD-free laser bars were fabricated with maximum efficiency above 66%. For short bars consisting of five 100μm wide emitters 75W CW maximum output power was reached. In QCW-mode up to 140W are demonstrated. The 10% fill factor bars with 4mm cavity are mounted with hard solder. Lifetime tests in long pulse mode with 35W output power exceed 5000 hours of testing without degradation or spontaneous failures. Slow axis divergence stays below 7° up to power levels of 40W and is suitable for simple fiber coupling into 200μm NA 0.22 fibers with SAC and FAC lenses. For fiber coupling based on beam rearrangement with step mirrors, bars with higher fill factor of 50% were fabricated and tested. The 4mm cavity short bars reach efficiencies above 60%. Lifetime tests at accelerated powers were performed. Finally fiber coupling results with output powers of up to 2.4 kW and beam quality of 30 mm mrad are demonstrated.

Paper Details

Date Published: 17 February 2010
PDF: 8 pages
Proc. SPIE 7583, High-Power Diode Laser Technology and Applications VIII, 75830T (17 February 2010); doi: 10.1117/12.841775
Show Author Affiliations
Harald König, OSRAM Opto Semiconductors GmbH (Germany)
Guenther Grönninger, OSRAM Opto Semiconductors GmbH (Germany)
Christian Lauer, OSRAM Opto Semiconductors GmbH (Germany)
Wolfgang Reill, OSRAM Opto Semiconductors GmbH (Germany)
Markus Arzberger, OSRAM Opto Semiconductors GmbH (Germany)
Uwe Strauß, OSRAM Opto Semiconductors GmbH (Germany)
Heiko Kissel, DILAS Diodenlaser GmbH (Germany)
Jens Biesenbach, DILAS Diodenlaser GmbH (Germany)
Arnd Kösters, Laserline GmbH (Germany)
Joerg Malchus, Laserline GmbH (Germany)
Volker K. Krause, Laserline GmbH (Germany)

Published in SPIE Proceedings Vol. 7583:
High-Power Diode Laser Technology and Applications VIII
Mark S. Zediker, Editor(s)

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