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Proceedings Paper

Brilliant low-fill-factor diode laser bars at 9xx nm for fiber coupling
Author(s): Harald König; Günther Grönninger; Christian Lauer; Andreas Hammer; Josip Maric; Uwe Strauss; Heiko Kissel; Matthias Haag; Jens Biesenbach
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Paper Abstract

New semiconductor multi emitters combine the advantages of laser bars and strength of single emitters for fiber coupling applications. We introduce a new technology to drive the device at highest power density at the laser facet. The new technology enables us to reduce the fill factor while maintaining output power per laser bar at reliable and efficient operation. The overall output power and slow axis beam parameter product is scaled with the numbers of emitters and may be coupled into a single fiber with low effort in beam shaping or fiber combining. We demonstrate that multi emitters can operate at same power level as the same number of single emitters. In this paper we present data on highly efficient and reliable 9xx nm laser bars designed for a defined fiber diameter and numerical aperture. For comparison single emitters and short bars with different fill factors were investigated. Efficiencies above 60% were reached with 4mm cavity length and fast axis far field angles of 45° (95%). Stable operation at powers up to 70W from short bars with five 100μm wide emitters was reached. Slow axis divergence is below 7° up to power levels of 38W and is suitable for coupling into 200μm NA 0.22 fibers with only slow axis and fast axis collimation without beam rearrangement.

Paper Details

Date Published: 12 February 2009
PDF: 8 pages
Proc. SPIE 7198, High-Power Diode Laser Technology and Applications VII, 719803 (12 February 2009); doi: 10.1117/12.808197
Show Author Affiliations
Harald König, OSRAM Opto Semiconductors GmbH (Germany)
Günther Grönninger, OSRAM Opto Semiconductors GmbH (Germany)
Christian Lauer, OSRAM Opto Semiconductors GmbH (Germany)
Andreas Hammer, OSRAM Opto Semiconductors GmbH (Germany)
Josip Maric, OSRAM Opto Semiconductors GmbH (Germany)
Uwe Strauss, OSRAM Opto Semiconductors GmbH (Germany)
Heiko Kissel, DILAS Diodenlaser GmbH (Germany)
Matthias Haag, DILAS Diodenlaser GmbH (Germany)
Jens Biesenbach, DILAS Diodenlaser GmbH (Germany)

Published in SPIE Proceedings Vol. 7198:
High-Power Diode Laser Technology and Applications VII
Mark S. Zediker, Editor(s)

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