Spatially resolved spectroscopy of alkali metal vapour diffusing inside hollow-core photonic crystal fibres

We present a new type of compact and all-glass based vapour cell integrating hollow-core photonic crystal fibres. The absence of metals, as in a traditional vacuum chamber and the much more compact geometry allows for fast and homogeneous heating. As a consequence we can fill the fibres on much faster timescales, ranging from minutes to hours. Additionally the all-glass design ensures optical access along the fibre. This allows live monitoring of the diffusion of rubidium atoms inside the hollow-core by measuring the frequency-dependent fluorescence from the atoms. The atomic density is numerically retrieved using a five-level system of Bloch-equations.

Automated summary

This new type of compact and all-glass based vapour cell integrated with hollow-core photonic crystal fibers allows for faster and more uniform heating, leading to quicker filling of fibers. The all-glass design provides optical access along the fiber for live monitoring of rubidium atoms diffusion. The atomic density can be numerically retrieved using a five-level system of Bloch equations.