Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 9: Quanteneffekte: Interferenz und Korrelationen
Q 9.8: Vortrag
Montag, 12. März 2012, 15:45–16:00, V7.01
Photon statistics at the transition from amplified spontaneous emission (ASE) to stimulated emission — •Sébastien Hartmann, Martin Blazek, and Wolfgang Elsäßer — Institute of Applied Physics, TU Darmstadt, Germany
The intensity correlations g(2)(τ) of photonics beams are governed by the nature of the photon emission process. Whereas laser light originating from stimulated emission events exhibits g(2)(0)=1, spectrally broadband thermal light originating from spontaneous emission exhibits enhanced correlations with g(2)(0)=2, reflecting photon bunching. Ingredients of both, spontaneous and stimulated emission processes, are present in the ASE emitted by superluminescent diodes (SLD). In ASE, spontaneously emitted photons experience a moderate amplification by stimulated emission, resulting in particularly interesting intensity correlations. Recently, it has been demonstrated that the intensity correlations of light emitted by SLDs can be tuned from thermal, i.e. g(2)(0)=2 to nearly laserlike, i.e. g(2)(0)=1.33 by increasing the spectral gain of the device [1]. Here, we comprehensively study this transition from ASE to stimulated emission, by applying optical feedback onto the SLD. Thus, we provide a deeper inside in the delicate emission state hierarchy in ASE sources.
[1] M. Blazek, S. Hartmann, A. Molitor and W. Elsäßer, "Unifying intensity noise and second-order coherence properties of amplified spontaneous emission sources", Optics Letters, Vol. 36, Issue 17, pp. 3455-3457 (2011)