Berlin 2014 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 16: Poster: Quantum information, micromechanical oscillators, matter wave optics, precision measurements and metrology
Q 16.41: Poster
Monday, March 17, 2014, 16:30–18:30, Spree-Palais
An ion as a probe for focus characterization — •Marianne Bader1,2, Martin Fischer1,2, Paul Roth1,2, Markus Sondermann1,2, and Gerd Leuchs1,2 — 1Max-Planck-Institute for the Science of Light, Erlangen, Germany — 2Institute of Optics, Information and Photonics, University of Erlangen-Nuremberg, Erlangen, Germany
The strength of coupling between light and a single quantum system can be optimized by matching the incident light mode to the emission pattern of the quantum system. For atoms in free space, the emission is usually a dipole wave. We aim for mode-matching to this radiation pattern by placing a single ion in the focus of a parabolic mirror [1]. The mirror allows for illumination from 94% of the solid angle when weighted with the dipole pattern. In first experiments, the focusing geometry was restricted to half solid-angle. We have reached 7.2% coupling efficiency instead of the 50% maximum possible in this scenario. The missing factor is only 7.
In this contribution, we present attempts to investigate this discrepancy. Among them are first experiments with full solid-angle illumination. In other experiments we adress a different atomic transition than in the above mentioned experiments. This transition has a longer wavelength and is thus less sensitive to aberrations of the parabolic mirror.
[1] R. Maiwald et al., Phys. Rev. A 86, 043431 (2012)
[2] M. Fischer et al., arXiv:1311.1982 (2013)