To undertake a research project in a multi-disciplinary field at the frontier of atoms physics, fibre-photonics, cold atoms and lasers. The post-doctoral project aims to demonstrate superradiance in cold rubidium confined in a hollow core photonic crystal fiber, and assess it for the development of ultra-stable laser source. The research program requires (i) micro-confining and laser cooling rubidium atom inside the core of a hollow core fiber, (ii) exploring cooperative effects and (iii) generation and characterization of superradiance. The project is part of the FETOPEN project CRYST^3 funded by the European Research Council.