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Proceedings Paper

GaSb-based VECSEL exhibiting multiple-watt output power and high beam quality at a lasing wavelength of 2.25 um
Author(s): B. Rösener; N. Schulz; M. Rattunde; C. Manz; K. Köhler; J. Wagner
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Paper Abstract

We report the realization of GaSb-based optically pumped vertical-external-cavity surface-emitting lasers (VECSELs) emitting at 2.25 μm which are capable of multiple-Watt output power. VECSEL structures were grown on GaSb-substrates by molecular beam epitaxy. SiC heat spreaders were capillary bonded onto the surface of the VECSEL chip in order to facilitate efficient heat removal. A continuous-wave output power of more than 3.4 W was recorded at a heat sink temperature of -10 °C. At room temperature (20 °C) we still obtained more than 1.6 W output power. A beam propagation factor in the range of M2≤5 was measured at maximum output power. In adjusting the fundamental mode diameter on the VECSEL chip to the pump spot diameter the beam quality could be further improved resulting in a beam propagation factor of M2~1.5. Furthermore, initial results on a GaSb-based dual-chip VECSEL are reported, capable of delivering a maximum output power of 3.3 W for a heat sink temperature of 20 °C and an emission wavelength of 2.25 μm.

Paper Details

Date Published: 8 May 2008
PDF: 13 pages
Proc. SPIE 6997, Semiconductor Lasers and Laser Dynamics III, 699702 (8 May 2008); doi: 10.1117/12.781143
Show Author Affiliations
B. Rösener, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
N. Schulz, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
M. Rattunde, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
C. Manz, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
K. Köhler, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
J. Wagner, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)

Published in SPIE Proceedings Vol. 6997:
Semiconductor Lasers and Laser Dynamics III
Krassimir P. Panajotov; Marc Sciamanna; Angel A. Valle; Rainer Michalzik, Editor(s)

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