Share Email Print

Proceedings Paper

Advances in performance and beam quality of 9xx-nm laser diodes tailored for efficient fiber coupling
Author(s): Christian Lauer; Harald König; Günther Grönninger; Sebastian Hein; Alvaro Gomez-Iglesias; Michael Furitsch; Josip Maric; Heiko Kissel; Paul Wolf; Jens Biesenbach; Uwe Strauss
Format Member Price Non-Member Price
PDF $17.00 $21.00

Paper Abstract

The impact of new direct-diode and fiber laser systems on industrial manufacturing drives the demand for highbrightness diode laser pump sources suitable for simple fiber coupling with high efficiency. Within the German funded project HEMILAS laser mini-bars with different bar geometries and small fill factors were investigated. We present results on 9xx nm bars with tailored beam parameter products for simplified coupling to fibers with core diameters of 200μm and 300μm with a numerical aperture of 0.22 and compare beam quality parameters, brightness, conversion efficiency, and thermal performance of different bar designs. Optimized epitaxy structures yield conversion efficiency maxima above 66%. The slow axis divergence angle of mini-bars with a fill factor of 10% featuring five 100μm wide and 4mm long emitters based on this epitaxy structure stays below 7°, which corresponds to a beam parameter product of 15mm mrad, up to very high output power of over 45W. This result was achieved for mounting on actively cooled submounts using hard solder. A similar bar with 5mm cavity length and using soft soldering reached an output power of 60W at the same beam parameter product. At 4mm cavity length, no COMD failures were observed up to currents exceeding the thermal rollover and the maximum output cw power was 95W.

Paper Details

Date Published: 8 February 2012
PDF: 10 pages
Proc. SPIE 8241, High-Power Diode Laser Technology and Applications X, 824111 (8 February 2012); doi: 10.1117/12.908421
Show Author Affiliations
Christian Lauer, OSRAM Opto Semiconductors GmbH (Germany)
Harald König, OSRAM Opto Semiconductors GmbH (Germany)
Günther Grönninger, OSRAM Opto Semiconductors GmbH (Germany)
Sebastian Hein, OSRAM Opto Semiconductors GmbH (Germany)
Alvaro Gomez-Iglesias, OSRAM Opto Semiconductors GmbH (Germany)
Michael Furitsch, OSRAM Opto Semiconductors GmbH (Germany)
Josip Maric, OSRAM Opto Semiconductors GmbH (Germany)
Heiko Kissel, DILAS Diodenlaser GmbH (Germany)
Paul Wolf, DILAS Diodenlaser GmbH (Germany)
Jens Biesenbach, DILAS Diodenlaser GmbH (Germany)
Uwe Strauss, OSRAM Opto Semiconductors GmbH (Germany)

Published in SPIE Proceedings Vol. 8241:
High-Power Diode Laser Technology and Applications X
Mark S. Zediker, Editor(s)

© SPIE. Terms of Use
Back to Top
Sign in to read the full article
Create a free SPIE account to get access to
premium articles and original research
Forgot your username?