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The Strathprints institutional repository is a digital archive of University of Strathclyde's Open Access research outputs. Strathprints provides access to thousands of Open Access research papers by University of Strathclyde researchers, including by researchers from the Department of Computer & Information Sciences involved in mathematically structured programming, similarity and metric search, computer security, software systems, combinatronics and digital health.

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Analysis and optimization of coupling to external cavities in feedback experiments with vertical-cavity surface-emitting lasers

Jentsch, K.F. and Sondermann, M. and Ackemann, T. (2008) Analysis and optimization of coupling to external cavities in feedback experiments with vertical-cavity surface-emitting lasers. Optics Communications, 281 (6). pp. 1396-1400. ISSN 0030-4018

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Abstract

The feedback strength is a crucial parameter for feedback experiments using semiconductor lasers. In this article, the coupling efficiency of the field of vertical-cavity surface-emitting lasers (VCSELs) to external cavities containing one collimating lens has been analyzed in detail using ABCD-matrix methods. It is found that for a given set of parameters there are two distinct, experimentally realizable positions of the collimating lens which allow for optimal coupling, if the cavity length is sufficiently small. The predictions are verified in experiments using single-transverse-mode VCSELs. The obtained coupling efficiencies exceed 70%.