Hannover 2013 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 39: Quantum effects: Light scattering and propagation

Q 39.1: Vortrag

Mittwoch, 20. März 2013, 14:00–14:15, F 342

Diffractionless image propagation without absorption — •lida zhang and jörg evers — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany

Recently, Firstenberg et al. have proposed and experimentally demonstrated a novel method to eliminate diffraction of a probe field carrying an arbitrary image in a thermal atomic medium[1,2]. Their method takes advantage of the thermal atomic motion and collisions. Control fields are applied such that momentum space components of the probe beam exhibits stronger coupling to the atoms moving in the opposite direction such that they are effectively carried back towards the main axis. But while this method eliminates the diffraction of the probe field, it necessarily involves strong absorption, and therefore is impractical.

Here we propose an enhanced scheme in which images encoded onto a probe field can be propagated diffractionless without absorption. An additional incoherent pump field is employed which together with the coupling fields generates additional atomic coherences such that gain is established for the probe. This way, the absorption of the probe due to single-photon absorption can be compensated by the gain. Based on this setup, prospects for various applications are discussed.

[1] O. Firstenberg, M. Shuker, N. Davidson, and A. Ron, Phys. Rev. Lett. 102, 043601 (2009).

[2] O. Firstenberg, P. London, M. Shuker, A. Ron and N. Davidson, Nature Phys. 5, 665 (2009).