Dresden 2006 – wissenschaftliches Programm
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HL: Halbleiterphysik
HL 16: Semiconductor laser I
HL 16.1: Vortrag
Dienstag, 28. März 2006, 11:00–11:15, BEY 154
Spatio-Temporal Emission Dynamics of VCSELs with a Surface Grating — •Christian Fuchs1, Tobias Gensty1, Joachim Kaiser1, Johannes Michael Ostermann2,3, Pierluigi Debernardi3, and Wolfgang Elsäßer1 — 1Institut für Angewandte Physik, Schloßgartenstr. 7, 64289 Darmstadt, Germany — 2Optoelectronics Department, University of Ulm, Albert-Einstein-Allee 45, 89069 Ulm, Germany — 3IEIIT-CNR c/o Politecnico di Torino, 10129 Torino, Italy
VCSELs are a low-cost lightsource for optical datacom applications. Because of the modal dispersion in fibers, not only spectrally single-mode, but in addition polarisation stable emission with high Orthogonal Polarisation Suppression Ratio (OPSR) at high output power is desired. We present 2D-spatially, spectrally and polarisation resolved picosecond measurements of the nearfield emission dynamics of small diameter oxide-confined VCSELs with an integrated surface grating based on a relief technique to enhance the selection of one polarisation mode [1]. The characterisation of the repetitive part of the dynamics within the turn-on process is realized with Temporally Resolved Imaging by Differential Analysis (TRIDA) providing a time resolution down to 10 ps. In addition single-shot measurements are performed to analyse the non-repetitive part of the emission dynamics. The influence of the grating parameters on the polarisation behaviour is discussed in comparison to numerical simulations.
[1] J.M. Ostermann, P. Debernardi, C. Jalics, A. Kroner, M.C. Riedl, R. Michalzik, Opt. Commun. 246, 511 (2005)