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Proceedings Paper

Diode laser modules based on new developments in tapered and broad area diode laser bars
Author(s): Bernd Köhler; Sandra Ahlert; Thomas Brand; Matthias Haag; Heiko Kissel; Gabriele Seibold; Michael Stoiber; Jens Biesenbach; Wolfgang Reill; Günter Grönninger; Martin Reufer; Harald König; Uwe Strauß
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Paper Abstract

In the last few years an increasing demand for high-brightness diode laser sources is observable, which is mainly driven by applications for fiber laser pumping and materials processing. A number of different approaches have been investigated in the past for the realization of such systems. In this paper we compare different concepts for high-brightness, high-power diode laser modules that are based on the new generation of tapered diode laser bars and new developments in broad area diode laser bars, respectively. One of the main advantages of tapered diode laser bars is the good beam quality in the slow-axis direction, which allows the design of high-power laser systems with a symmetric beam profile without the necessity of using sophisticated beam shaping systems. Such laser modules with multiple bars aiming for kilowatt output power can be realized with different incoherent coupling principles, including spatial multiplexing, polarization multiplexing and wavelength multiplexing. On the other hand, modules with a single or only a few tapered diode laser bars aim for very high brightness suitable for fiber coupling with fiber diameters down to 50 μm with a numerical aperture (NA) of 0.22. In this paper we present a detailed characterization of the new generation of tapered diode laser bars, including typical electro-optical data, measurements of beam quality and lifetime data. Tapered diode laser bars typically suffer from a broad spectrum which is extremely obstructive for pumping applications with small absorption bandwidths. To overcome this disadvantage we used volume bragg gratings (VBG) to improve the spectral quality of tapered diode laser bars. In addition to further improve the brightness of such diode laser systems we investigated external phaseplates to correct for smile and lens aberrations.

Paper Details

Date Published: 25 February 2008
PDF: 11 pages
Proc. SPIE 6876, High-Power Diode Laser Technology and Applications VI, 68761B (25 February 2008); doi: 10.1117/12.763012
Show Author Affiliations
Bernd Köhler, DILAS Diodenlaser GmbH (Germany)
Sandra Ahlert, DILAS Diodenlaser GmbH (Germany)
Thomas Brand, DILAS Diodenlaser GmbH (Germany)
Matthias Haag, DILAS Diodenlaser GmbH (Germany)
Heiko Kissel, DILAS Diodenlaser GmbH (Germany)
Gabriele Seibold, DILAS Diodenlaser GmbH (Germany)
Michael Stoiber, DILAS Diodenlaser GmbH (Germany)
Jens Biesenbach, DILAS Diodenlaser GmbH (Germany)
Wolfgang Reill, OSRAM Opto Semiconductors GmbH (Germany)
Günter Grönninger, OSRAM Opto Semiconductors GmbH (Germany)
Martin Reufer, OSRAM Opto Semiconductors GmbH (Germany)
Harald König, OSRAM Opto Semiconductors GmbH (Germany)
Uwe Strauß, OSRAM Opto Semiconductors GmbH (Germany)

Published in SPIE Proceedings Vol. 6876:
High-Power Diode Laser Technology and Applications VI
Mark S. Zediker, Editor(s)

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