Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 30: Poster: Photonics, laser development and applications, ultrashort laser pulses, quantum effects

Q 30.70: Poster

Dienstag, 18. März 2014, 16:30–18:30, Spree-Palais

Light characteristics of quantum dot SLEDs — •Franziska Friedrich and Reinhold Walser — Institute of Applied Physics, TU Darmstadt, Germany

Light emitting quantum dot SLED shows unusual behavior: a broad spectral width of some THz and simultaneously second order coherence of 1.33 at a temperature of 190K [1]. This “hybrid coherent” light arises at the transition of spontaneous to stimulated emission, the range of amplified spontaneous emission (ASE), and has been observed experimentally [2]. The novel light states are interesting objects for fundamental physics on one hand and could find applications in medical diagnostics (OCT) on the other hand.

To understand the physics of the phenomenon of hybrid coherence, we have developed a laser model describing the characteristics of the semiconductor device as well as its observed correlation properties [3]. In particular we have considered N driven quantum dot systems embedded in a cylindrical waveguide of high refractive index surrounded by two beam splitters. In this presentation we will be presenting our semiclassical analysis of the coupled Maxwell-Bloch equations.
M. Blazek et al., Optics Express 17, 16 (2009)
M. Blazek, W. Elsäßer, Phys. Rev. A 84, 063840 (2011)
F. Friedrich, MSc thesis "Hybrid coherent light: modeling quantum dot superluminescent diodes" (TU Darmstadt) (2013)