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Proceedings Paper

Optimized VCSELs for high-power arrays
Author(s): Holger Moench; Johanna S. Kolb; Andreas P. Engelhardt; Philipp Gerlach; Roland Jaeger; Jens Pollmann-Retsch; Ulrich Weichmann; Bernd Witzigmann
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Paper Abstract

High-power VCSEL systems with multi kilowatt output power require a good electro-optical efficiency at the point of operation i.e. at elevated temperature. The large number of optimization parameters can be structured in a way that separates system and assembly considerations from the minimization of electrical and optical losses in the epitaxially grown structure. Temperature dependent functions for gain parameters, internal losses and injection efficiency are derived from a fit to experimental data. The empirical description takes into account diameter dependent effects like current spreading or temperature dependent ones like voltage drops over hetero-interfaces in the DBR mirrors. By evaluating experimental measurements of the light output and voltage characteristics over a large range of temperature and diameter, wafer-characteristic parameters are extracted allowing to predict the performance of VCSELs made from this material in any array and assembly configuration. This approach has several beneficial outcomes: Firstly, it gives a general description of a VCSEL independent of its geometry, mounting and detuning, secondly, insights into the structure and the underlying physics can be gained that lead to the improvement potential of the structure and thirdly the performance of the structure in arrays and modules can be predicted. Experimental results validate the approach and demonstrate the significantly improved VCSEL efficiency and the benefit in high power systems.

Paper Details

Date Published: 27 February 2014
PDF: 8 pages
Proc. SPIE 9001, Vertical-Cavity Surface-Emitting Lasers XVIII, 90010F (27 February 2014); doi: 10.1117/12.2037608
Show Author Affiliations
Holger Moench, Philips Technologie GmbH (Germany)
Johanna S. Kolb, Philips Technologie GmbH (Germany)
Andreas P. Engelhardt, Univ. Kassel (Germany)
Philipp Gerlach, Philips Technologie GmbH U-L-M Photonics (Germany)
Roland Jaeger, Philips Technologie GmbH U-L-M Photonics (Germany)
Jens Pollmann-Retsch, Philips Technologie GmbH (Germany)
Ulrich Weichmann, Philips Technologie GmbH (Germany)
Bernd Witzigmann, Univ. Kassel (Germany)

Published in SPIE Proceedings Vol. 9001:
Vertical-Cavity Surface-Emitting Lasers XVIII
James K. Guenter; Chun Lei, Editor(s)

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