Berlin 2008 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 36: Poster III
HL 36.33: Poster
Mittwoch, 27. Februar 2008, 16:30–19:00, Poster D
Chirp dependent Emission of a fs-pumped Semiconductor Disc Laser — •Eckhard Kühn1, Angela Thränhardt1, Stephan W. Koch1, Wolfgang Stolz1, Sangam Chatterjee1, Christoph Lange1, Wolfgang Rühle1, Wendel Wohlleben2, and Marcus Motzkus3 — 1Fachbereich Physik, Philipps Universität Marburg, Deutschland — 2Polymer Research, BASF AG Ludwigshafen, Deutschland — 3Fachbereich Chemie, Philipps Universität Marburg, Deutschland
We present an experimental study and theoretical analysis of a semiconductor disc-laser system (VCSEL) under coherently controlled, phase sensitive excitation conditions. We show that the sign and the amplitude of the quadratical chirp modifies the total number and the average energy of the injected carriers. This strongly influences the laser gain and therefore the overall VCSEL emission. For the theoretical analysis of this effect, we use nonequilibrium simulations based on the microscopic carrier treatment of coupled Maxwell-multiband semiconductior Bloch Equations. This reveals the physical origin of the experimental findings as the change of the 1s exciton-resonance absorption of the quantum-well barriers due to excitation induced dephasing. The numerical simulations show good qualitative agreement with the experimental data.