Berlin 2001 – scientific programme

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Q: Quantenoptik

Q 19: Laser I

Q 19.1: Talk

Wednesday, April 4, 2001, 15:45–16:00, H 1012

Influence of Modal Characteristics on the Intensity Noise of a VCSEL — •Joachim Kaiser, Christian Degen, Ingo Fischer, and Wolfgang Elsäßer — Institut für Angewandte Physik, Technische Universität Darmstadt, Schloßgartenstr. 7, 64289 Darmstadt

We present experimental results of polarization-resolved noise measurements on Vertical-Cavity Surface-Emitting Lasers (VCSELs). In particular, we study the intensity noise of the two orthogonal polarizations and their correlation in small aperture oxide-confined VCSELs, which show a simple transverse mode structure. Investigations of various different VCSEL structures yield similar characteristic relations of polarization and transverse-mode behavior with intensity fluctuations in agreement with predictions of a rate equation based two-mode model: we demonstrate low noise emission — even 0.4 dB of amplitude squeezing — in a single-mode regime where one polarization mode is strongly supressed. Furthermore we find low noise emission in a two mode regime due to strong anticorrelation between the two modes.