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Proceedings Paper

A novel active region concept for highly efficient GaSb-based optically in-well pumped semiconductor disk lasers
Author(s): Joachim Wagner; Benno Rösener; Nicola Schulz; Marcel Rattunde; Rüdiger Moser; Christian Manz; Klaus Köhler
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Paper Abstract

A novel active region concept for GaSb-based optically pumped mid-infrared vertical external cavity surface emitting lasers (VECSELs, also referred to as optically pumped semiconductor disk lasers - OPSDLs) is presented. The concept is based on GaxIn1-xAsySb1-y type-I quantum wells (QWs) embedded between AlAs0.08Sb0.92 barrier layers designed for optical in-well pumping where the pump absorption at pump wavelengths between 1 μm and 2 μm takes place exclusively in the active QWs. This concept provides several advantages such as a high modal gain, the suppression of thermal leakage currents, and an improved thermal conductivity of the active region compared to a conventional GaInAsSb/AlGaAsSb active region design. Using the novel design approach an in-well pumped VECSEL emitting at 2.24 μm has been realized, yielding at a heat sink temperature of 20°C in continuous-wave operation a power slope efficiency of more than 32% and an absorption of the 1.96 μm pump light of more than 50% without pump recycling, These data constitute a significant improvement in device performance compared to previously reported data on in-well pumped GaSb-based VECSELs.

Paper Details

Date Published: 26 January 2009
PDF: 8 pages
Proc. SPIE 7222, Quantum Sensing and Nanophotonic Devices VI, 72220E (26 January 2009); doi: 10.1117/12.807922
Show Author Affiliations
Joachim Wagner, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Benno Rösener, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Nicola Schulz, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Marcel Rattunde, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Rüdiger Moser, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Christian Manz, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)
Klaus Köhler, Fraunhofer-Institut für Angewandte Festkörperphysik (Germany)

Published in SPIE Proceedings Vol. 7222:
Quantum Sensing and Nanophotonic Devices VI
Manijeh Razeghi; Rengarajan Sudharsanan; Gail J. Brown, Editor(s)

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