Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 58: Poster: Quantum Optics and Photonics IV
Q 58.35: Poster
Donnerstag, 3. März 2016, 16:30–19:00, Empore Lichthof
Photon statistics of quantum-dot superluminescent diodes — •Franziska Friedrich and Reinhold Walser — Institut für Angewandte Physik, Darmstadt, Germany
Commercial devices for optical coherence tomography greatly benefit from the appealing features of broadband light emitting quantum-dot superluminescent diodes (QDSLDs), where light is generated in the regime of amplified spontaneous emission (ASE).
But also from the fundamental point of view, these devices exhibit uncommon properties considering field and intensity correlations, g(1)(τ) and g(2)(τ): a reduction of g(2)(0) from 2 to 1.33 at T=190 K was observed in the lab in 2011 [1].
The understanding of these hybrid coherent light states, which are simultaneously incoherent in g(1)(τ) and coherent in g(2)(τ), represents an interesting and challenging topic of research.
In a previous study [2], we assumed that the quantum state of the emitted diode light is well described by a multimode phase-randomized Gaussian (PRAG) state. Amongst sundry results, the experiment measured time resolved g(2)(τ) in the fs time scale using modern fast two-photon detectors. It turned out that the assumption of PRAG states agrees with experimental findings.
In the present contribution, we will discuss a model of the QDSLD and study the generation of the amplified spontaneous emission on a microscopic level [3].
M. Blazek, W. Elsäßer, Phys. Rev. A 84, 063840 (2011)
S. Hartmann et al., New J. Phys. 17, 043039 (2015)
to be published