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Laser Diode Facet Degradation Study

Published online by Cambridge University Press:  01 February 2011

Ulrich T. Schwarz ,
Thomas Schoedl ,
V. Kümmler ,
A. Lell  and
V. Härle
Ulrich T. Schwarz
Affiliation:
Angewandte und Experimentelle Physik, Universität Regensburg, 93040 Regensburg, Germany
Thomas Schoedl
Affiliation:
Angewandte und Experimentelle Physik, Universität Regensburg, 93040 Regensburg, Germany
V. Kümmler
Affiliation:
OSRAM Opto Semiconductors GmbH, Wernerwerkstr. 2, 93049 Regensburg, Germany
A. Lell
Affiliation:
OSRAM Opto Semiconductors GmbH, Wernerwerkstr. 2, 93049 Regensburg, Germany
V. Härle
Affiliation:
OSRAM Opto Semiconductors GmbH, Wernerwerkstr. 2, 93049 Regensburg, Germany
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Abstract

We study the degradation behaviour of GaN gain guided laser diodes (LDs) on SiC substrates with cleaved facets and reflective coatings on none, one, or both facets. This allows us to demonstrate that in addition to volume effects there is a contribution of the laser facets to laser degradation. We observe that for the uncoated LDs the threshold current density is increasing considerably faster compared to LDs with mirror coatings. Degradation is observed during operation but not during storage at ambient conditions and thus expected to be photon or current induced. Operation of the uncoated laser in a nitrogen atmosphere reduces the degradation rate with respect to operation in air.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 798: Symposium Y – GaN and Related Alloys , 2003 , Y11.10
Copyright
Copyright © Materials Research Society 2004

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References

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