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Unravelling superradiance, also known as superfluorescence, relies on anensemble of phase-matched dipole oscillators and the suppression ofinhomogeneous broadening. Here we report on a novel superradiance platform thatcombines an optical lattice free from the ac Stark shift and a hollow-corephotonic crystal fibre, enabling an extended atom-light interaction over $2\mathrm{mm}$ free from the Doppler effect. This system allows controlling theatom spatial distribution and spectral homogeneity whilst efficiently couplingthe radiation field to an optical fibre. The experimentally-observed andtheoretically-corroborated temporal, spectral and spatial dynamic behaviours ofthe superradiance, e.g., superradiance ringing and density-dependent frequencyshift, demonstrate a unique interplay between the trapped atoms and thefibre-guided field with multiple transverse modes. Our theory indicates theresulting temporal evolution of the guided light shows a minimal beam radius of$3.1 \mathrm{\mu m}$ that is three times smaller than that of the lowest-lossfibre mode.

Superradiance from Lattice-Confined Atoms inside Hollow Core Fibre