Unravelling superradiance, also known as superfluorescence, relies on an ensemble of phase-matched dipole oscillators and the suppression of inhomogeneous broadening. Here we report a superradiance platform that combines an optical lattice free from the ac Stark shift and a hollow-core photonic crystal fibre, enabling an extended atom-light interaction over 2 mm free from the Doppler effect. This system allows control of the atom spatial distribution and spectral homogeneity whilst efficiently coupling the radiation field to an optical fibre. The experimentally-observed and theoretically-corroborated temporal, spectral and spatial dynamic behaviours of the superradiance, e.g., superradiance ringing and density-dependent frequency shift, demonstrate a unique interplay between the trapped atoms and the fibre-guided field with multiple transverse modes. Our theory indicates that the resulting temporal evolution of the guided light shows a minimal beam radius of 3.1 µm which is three times smaller than that of the lowest-loss fibre mode.

解散超辐射，也称为超荧光，依赖于相匹配的偶极子振荡器和不均匀展宽的抑制。在这里，我们报告了一个超辐射平台，该平台结合了无ac斯塔克频移的光学晶格和中空光子晶体光纤，可实现超过2 mm的扩展的原子-光相互作用而不受多普勒效应的影响。该系统允许控制原子的空间分布和光谱均匀性，同时有效地将辐射场耦合到光纤上。实验观察到并在理论上证实了超辐射的时间，光谱和空间动态行为，例如，超辐射振铃和密度相关的频移，展示了被俘获的原子与具有多个横向模式的纤维引导场之间的独特相互作用。我们的理论表明，导光的最终时间演变显示出最小的光束半径为3.1 µm，比最小损耗光纤模式的最小半径小三倍。