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Proceedings Paper

8-W high-efficiency high-brightness tapered diode lasers at 976 nm
Author(s): Márc T. Kelemen; Jürgen Weber; Gudrun Kaufel; Rudolf Moritz; Michael Mikulla; Günter Weimann
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Paper Abstract

Today tapered diode lasers are mainly used in external resonator configuration for non-linear spectroscopy or frequency doubling for blue-green outputs. Now increased output power and brightness make tapered lasers even attractive for pumping of fibre amplifiers or lasers and fibre coupled modules. We have realized high-power ridge-waveguide tapered diode lasers emitting at 976 nm. The high material quality of the MBE-grown laser structures yields a high internal efficiency of more than 97% and low internal losses of 0.5 cm-1. Tapered single emitters consist of a ridge section with a length of 500 μm and a taper section with a length of 3000 μm. The taper angle was 6°. A threshold current of 1.07 A corresponding to a threshold current density of 222 A/cm2 has been obtained. The maximum slope efficiency of 1.09 W/A together with the low series resistance of 35 m Ω results in a high wall-plug efficiency of 58% at 5.5 W output power. This high wall-plug efficiency remains nearly constant up to operation currents of 9 A corresponding to output powers of more than 8 W. At an operation current of 15 A an output power of 12.5 W has been achieved, which is to our knowledge the highest output power in continuous wave mode for tapered diode lasers reported so far. At 8 W a nearly diffraction limited behavior with values for M2 of less than 1.5 have been observed resulting in a brightness of more than 660 MW/cm2.

Paper Details

Date Published: 15 February 2006
PDF: 9 pages
Proc. SPIE 6104, High-Power Diode Laser Technology and Applications IV, 61040D (15 February 2006); doi: 10.1117/12.643822
Show Author Affiliations
Márc T. Kelemen, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Jürgen Weber, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Gudrun Kaufel, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Rudolf Moritz, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Michael Mikulla, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Günter Weimann, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)

Published in SPIE Proceedings Vol. 6104:
High-Power Diode Laser Technology and Applications IV
Mark S. Zediker, Editor(s)

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