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Proceedings Paper

Modeling of the performance of high-brightness tapered lasers
Author(s): Stephane Mariojouls; Stefan Morgott; Alexis Schmitt; Michael Mikulla; Juergen Braunstein; Guenter Weimann; Francoise Lozes; Sophie Bonnefont
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Paper Abstract

A comprehensive model has been developed to study the operating characteristics of high-power high-brightness lasers consisting of a ridge-waveguide section coupled to a tapered region. The model, based on the Beam Propagation Method (BPM), includes a non-linear gain coefficient, current spreading due to junction voltage, and thermal effects taking into account for the first time to our knowledge a longitudinal gradient in the device temperature. We first demonstrate that during operation unwanted radiation that does not couple into the lateral mode of the waveguide, systematically propagates into the tapered region, and leads to the deterioration of the beam quality. To deflect and scatter this radiation, the use of specific cavity-spoiling elements, consisting of grooves etched down through the active region, appears necessary. We also study the role of the ridge section length in the operation of the device. A long ridge-waveguide region, providing both a well defined fundamental mode in the ridge- waveguide, and a gain saturation in the tapered region, improves the beam stability, but can lead, on the other hand, to optical self-focusing. Thermal effects are also investigated. We show how thermal lensing induces a lateral quadratic phase curvature and therefore alters the astigmatism of the device.

Paper Details

Date Published: 14 July 2000
PDF: 12 pages
Proc. SPIE 3944, Physics and Simulation of Optoelectronic Devices VIII, (14 July 2000); doi: 10.1117/12.391444
Show Author Affiliations
Stephane Mariojouls, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Stefan Morgott, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Alexis Schmitt, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Michael Mikulla, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Juergen Braunstein, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Guenter Weimann, Fraunhofer-Institut fuer Angewandte Festkoerperphysik (Germany)
Francoise Lozes, Lab. d'Analyse et d'Architecture des Systemes du CNRS (France)
Sophie Bonnefont, Lab. d'Analyse et d'Architecture des Systemes du CNRS (France)

Published in SPIE Proceedings Vol. 3944:
Physics and Simulation of Optoelectronic Devices VIII
Rolf H. Binder; Peter Blood; Marek Osinski, Editor(s)

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