Dresden 2011 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 88: Lasers
HL 88.12: Vortrag
Freitag, 18. März 2011, 13:15–13:30, POT 151
Spin induced polarization oscillations in vertical-cavity surface-emitting laser devices — •Mingyuan Li1, Henning Soldat1, Hendrik Jähme1, Nils C. Gerhardt1, Martin R. Hofmann1, and Thorsten Ackemann2 — 1Chair of Photonics and Terahertz-Technology, Ruhr University of Bochum, Germany — 2SUPA and Department of Physics, University of Strathclyde, Glasgow, Scotland, UK
The capabilities of spin controlled vertical-cavity surface-emitting lasers (VCSELs) such as high-speed modulation and amplification of spin information due to the nonlinearity at threshold offer a promising method of communication with enhanced bandwidth. We investigate the polarization dynamics of electrically pumped vertical-cavity surface-emitting lasers after additional spin injection at room temperature. The experimental results demonstrate a stable polarization oscillations with a frequency in the high GHz range, which is determined by device parameters such as linear birefringence and linear dichroism. A theoretical calculation on the basis of a rate equation model is performed, in order to understand the underlying mechanism for coupling between the dynamics and device parameters. The calculation reveals a possibility to control the frequency of the oscillations by tuning the birefringence.