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arXiv 2003.066322020-03-14physics.atom-ph

Superradiance from Lattice-Confined Atoms inside Hollow Core Fibre

Shoichi Okaba, Deshui Yu, Luca Vincetti, Fetah Benabid, Hidetoshi Katori

备注：: 41 pages, 8 figures in total, the first 30 pages and 6 figures are main article and the remaining pages and figures are supplemental material
发表信息：: Communications Physics 2, Article number: 136 (2019)
DOI：: 10.1038/s42005-019-0237-2

英文摘要：

Unravelling superradiance, also known as superfluorescence, relies on an ensemble of phase-matched dipole oscillators and the suppression of inhomogeneous broadening. Here we report on a novel 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 $2 \mathrm{mm}$ free from the Doppler effect. This system allows controlling 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 the resulting temporal evolution of the guided light shows a minimal beam radius of $3.1 \mathrm{μm}$ that is three times smaller than that of the lowest-loss fibre mode.

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