Hannover 2016 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 11: Poster: Quantum Optics and Photonics I
Q 11.40: Poster
Montag, 29. Februar 2016, 16:30–19:00, Empore Lichthof
Towards efficient coupling of light and a single two level atom in free space — •Lucas Alber1,2, Bharath Srivathsan1, Martin Fischer1,2, Markus Weber1, Markus Sondermann1,2, and Gerd Leuchs1,2,3 — 1Max-Planck-Institute for the Science of Light, Erlangen, Germany — 2Friedrich-Alexander University Erlangen- Nürnberg (FAU), Department of Physics, Erlangen, Germany — 3Department of Physics, University of Ottawa, Canada
We report on the efficient free-space interaction between light and a single trapped ion. This is accomplished by transforming a paraxial Gaussian beam into a spherical linear dipole wave using a radial polarization converter and a deep parabolic mirror. We measure the phase shift imprinted on a weak coherent beam by a single 174Yb+ ion trapped in the focus of the parabolic mirror. Our first result matches the best value reported in any free space experiment so far. The achieved phase shift is mainly limited by aberrations of the parabolic mirror, the twofold degenerady of the ground level, and the spatial spread of the ion’s wave function. We will overcome these limitations by using a deformable mirror for aberration correction and by trapping of a 174Yb2+ ion. The latter species comprises a closed two level transition with a comparably small natural linewidth.