Heidelberg 2015 – scientific programme
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A: Fachverband Atomphysik
A 21: Ultra-cold plasmas and Rydberg systems II (with Q)
A 21.3: Talk
Wednesday, March 25, 2015, 11:30–11:45, C/kHS
Rydberg atoms in hollow-core photonic crystal fibres — •Georg Epple1,2, Christian Veit1, Kathrin Kleinbach1, Tijmen Euser2, Tilman Pfau1, Philip Russell2, and Robert Löw1 — 15. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70550 Stuttgart, Germany — 2Max Planck Institute for the Science of Light and Department of Physics, University of Erlangen-Nürnberg, Günther-Scharowsky-Str. 1, 91058 Erlangen, Germany
The exceptionally large polarizability of highly excited Rydberg atoms uniquely enables long-range interactions between atoms, giving rise to phenomena such as the Rydberg blockade. This makes them of great interest as sensitive electric field sensors or for creating optical nonlinearities at the single photon level. A promising route to technically feasible, miniaturized, room-temperature devices is the excitation of Rydberg atoms inside hollow-core photonic crystal fiber (HC-PCF). The confinement of both atoms and light in the hollow core results in perfect atom-light coupling. Recently we demonstrated coherent three-photon excitation to Rydberg states in a caesium vapour confined in both kagomé-style HC-PCFs and capillaries with various core diameters. Spectroscopic signals exhibiting sub-Doppler features were detected for principal quantum numbers up to n = 46. Our studies revealed that the frequencies of the absorption peaks measured in HC-PCF differed from those measured in a reference cell, suggesting interactions between the atoms and the core-walls. Our current goal is to better understand these line-shifts and to get insight into caesium diffusion in the fibres.