Superradiance from lattice-confined atoms inside hollow core fibre

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

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

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.

Original languageEnglish
Article number136
JournalCommunications Physics
Volume2
Issue number1
DOIs
Publication statusPublished - 1 Dec 2019

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