Hamburg 2009 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 27: Ultra-Cold Atoms, Ions and BEC III (with Q)

A 27.4: Vortrag

Donnerstag, 5. März 2009, 15:15–15:30, VMP 6 HS-C

Collective effects in ultracold atomic clouds interacting with a high-finesse resonator — •Simone Bux, Gordon Krenz, Sebastian Slama, Philippe Courteille, and Claus Zimmermann — Physikalisches Institut, Universität Tübingen

We study the coupled dynamics of ultracold or Bose-condensed atomic clouds or interacting with the modes of an optical high-finesse ring resonator. Our interest is focused on collective effects taking place in such systems, like Collective Atomic Recoil Lasing or superradiant Rayleigh scattering. We load ultracold atomic clouds into the light field supported by a laser-pumped ring resonator. Density fluctuations in the atomic cloud lead to strong transient backscattering of light, which is recorded in real time. The scattering couples and populates several quantized momentum states resolved in time-of-flight absorption images. Both, the optical and the matter wave signals are studied as a function of collective gain and detuning of the pump laser from the cavity resonance. We particularly focus our attention to the emergence of signatures of quantized motion in the gain profile and the threshold behaviour of the collective instability.