Micro lensing induced lineshapes in a single mode cold-atom hollow-core fiber interface

Abstract

We report on the observation of strong transmission line shape alterations in a cold-atom hollow-core fiber interface. We show that this can lead to a significant overestimation of the assigned resonant optical depth for high atom densities. By modeling light beam propagation in an inhomogeneous dispersive medium, we attribute the observations to micro lensing in the atomic ensemble in combination with the mode selection of the atom-fiber interface. The approach is confirmed by studies of Rydberg EIT line shapes.

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Cited by in corpus (10)

• Photon-photon interactions in Rydberg-atom arrays
• Controlled transport of stored light
• High-efficiency cold-atom transport into a waveguide trap
• Highly controlled optical transport of cold atoms into a hollow-core fiber
• Laser-cooled caesium atoms confined with magic-wavelength dipole inside a hollow-core photonic-bandgap fiber
• Loading and spatially-resolved characterization of a cold atomic ensemble inside a hollow-core fiber
• Optimal pulse propagation in an inhomogeneously gas-filled hollow-core fiber
• Spatial calibration of high-density absorption imaging
• Dispersive detection of atomic ensembles in the presence of strong lensing
• Observation of photon recoil effects in single-beam absorption spectroscopy with an ultracold strontium gas