Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 13: Ultracold plasmas and Rydberg systems II (with Q)
A 13.2: Talk
Monday, March 17, 2014, 14:15–14:30, DO24 1.101
Rydberg Excitation in Hollow Core Fiber — •Kathrin S. Kleinbach1, Georg Epple1,2, Tijmen G. Euser2, Nicolas Y. Joly2, Tilman Pfau1, Philip St.J. Russell2, and Robert Löw1 — 15. Physikalisches Institut, Universität Stuttgart, Stuttgart, Germany — 2Max Planck Institute for the Science of Light, Erlangen, Germany
Rydberg atoms exhibit large polarizabilities, long-range interactions and the Rydberg blockade effect. These special properties can be employed in sensitive electric field sensors or as optical non-linearities down to the single photon level. A promising way to reach applicability in technically feasible devices even at room temperature is the excitation of Rydberg atoms inside hollow core fiber, which can bring together highly excited atomic gases with the features and advantages of optical wave guiding structures. The confinement of the atoms and the light fields results in a perfect atom-light coupling.
We perform coherent three-photon excitation to Rydberg states in a cesium vapor confined in kagomé structured hollow core photonic crystal fiber and capillaries with various core diameters. Spectroscopic signals are detected for main quantum numbers up to n=46 exhibiting sub-Doppler features. The observation of line shifts inside the fiber with respect to a reference cell can be assigned to stray electric fields by comparison with well-known scaling laws of Rydberg states. By increasing the number density, and with this the optical density, inside the fiber we are able to eliminate almost all shifts. A detailed understanding of the origin and the disappearance of the shifts will be essential for the successful development of miniaturized fiber-devices.