Rydberg atoms inside hollow-core photonic crystal fibre

里德堡原子具有极端的性质。特别是，大的极化率导致了极强的相互作用，这可以被利用来产生光学非线性。在这个项目中，我们将研究中空纤芯中的热原子以及高激发里德堡原子之间的各种相互作用机制。准直的强光场、大的原子密度和光学深度、简单的几何结构和金属结构的集成是利用光学双稳态产生和检测窄带THz的理想组合。在双稳相中，在微波域或太赫兹域出现了很大的场。我们预计，在合适的几何结构下，我们可以产生超过1太赫兹的兆瓦功率，这在商业连续波系统中通常是无法实现的。下一步，我们想用陡峭的光谱特性作为太赫兹辐射的灵敏探测器。合奏的集体反应将导致一个非常灵敏的太赫兹功率计。最后，我们将研究van-der-Waals相互作用的影响，以及如何将其用于非线性光学，就像对超冷气体所做的那样。

Rydberg atoms have extreme properties. In particular the large polarizabilities lead to extremely strong interactions, which can be exploited to produce optical non-linearities. In this project we will study hot atoms inside hollow core fibres and various interaction mechanisms between highly excited Rydberg atoms. The combination of well collimated intense light fields, large atomic densities and optical depths, simple geometries and the integration of metallic structures is ideally suited to employ optical bistabilities for narrowband THz generation and detection. In the bistable phase emerge large fields in the microwave or THz domain. We expect that with a suitable geometry we can produce mW powers above one THz, which is usually not available with commercial cw-systems. In a next step we want to use the steep spectroscopic feature as a sensitive probe for THz radiation. The collective response of the ensemble will lead to a very sensitive THz Power-meter. Finally we will study the effect of the van-der-Waals interaction and how this can be exploited, in a similar manner as it is done with ultracold gases, for nonlinear optics.