Heidelberg 2015 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 8: Quantum Optics II
Q 8.4: Talk
Monday, March 23, 2015, 15:15–15:30, C/HSO
Coherence studies of light emitting quantum-dot superluminescent diodes — •Franziska Friedrich, Sebastien Hartmann, Wolfgang Elsäßer, and Reinhold Walser — Institut für Angewandte Physik, TU Darmstadt, Germany
During the last years broadband emitting quantum-dot superluminescent diodes (QD-SLEDs) became an essential element in modern research due to their high potential in industrial applications, e.g. in optical coherence tomography or fiber sensor technology. But also in fundamental research, QD-SLEDs appear to be fascinating semiconductor devices, because of their unusual behavior at a characteristic temperature regime: a reduction of g(2)(0) from 2 to 1.33 was observed in the laboratory in 2011 [1].
We develop a theoretical explanation of this experimental result. As a first step, we postulate a quantum state considering the light characteristics of the QD-SLED and study the first and second order correlation function, yielding information about the frequency spectrum and the photon statistics. In order to verify the validity of the chosen light state, we study g(2)(τ) of mixed light originating from a QD-SLED and a single mode laser. A comparison with the experimental results exhibits very good agreement [2].
M. Blazek and W. Elsässer, Phys. Rev. A 84, 063840 (2011)
to be submitted