Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 26: Quantum Optics IV
Q 26.1: Vortrag
Dienstag, 7. März 2017, 14:30–14:45, P 5
Spectral intensity correlations of broadband amplified spontaneous emission from superluminescent diodes — •Patrick Janassek, Sébastien Blumenstein, and Wolfgang Elsäßer — Institute of Applied Physics, Technische Universität Darmstadt, Germany
The intensity correlations of broadband light play an important role in understanding the physics of the emission processes. Photons emitted by thermal light sources show the well-known bunching effect which leads to a second-order coherence degree of g(2)(0)=2. However, the measurement of high-order coherence functions of broadband light sources such as superluminescent diodes (SLD) is particular challenging due to the very short correlation timescales. By exploiting two-photon-absorption (TPA) interferometry[1] the intensity correlations of the amplified spontaneous emission (ASE) from SLDs with THz-wide optical spectra can be measured. Here, we present experiments on varying spectral intensity correlations of SLD light. Within a TPA Mach-Zehnder interferometer configuration, intensity cross-correlation functions between different spectral components g(2)(τ , λ ) are determined. We observe a continuous reduction of the second-order coherence degree with increasing spectral separation of selected spectral windows measured by introducing variable bandpass filters in both arms of the interferometer. These observations suggest the existence of frequency correlations of bunched photons from ASE of SLDs.
[1] F. Boitier, A. Godard, E. Rosencher, and C. Fabre, Nat. Phys. 5, 267 (2009)