title: Cooperative Emission of a Pulse Train in an Optically Thick Scattering Medium.
abstract: An optically thick cold atomic cloud emits a coherent flash of light in the forward direction when the phase of an incident probe field is abruptly changed. Because of cooperativity, the duration of this phenomena can be much shorter than the excited lifetime of a single atom. Repeating periodically the abrupt phase jump, we generate a train of pulses with short repetition time, high intensity contrast, and high efficiency. In this regime, the emission is fully governed by cooperativity even if the cloud is dilute.
authors.affiliation: School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore, Singapore.
authors.forename: C C
authors.initials: CC
authors.lastname: Kwong
authors.affiliation: Centre for Quantum Technologies, National University of Singapore, 117543 Singapore, Singapore.
authors.forename: T
authors.initials: T
authors.lastname: Yang
authors.affiliation: Laboratoire Kastler Brossel, UPMC, CNRS, ENS, Collège de France, 4 Place Jussieu, F-75005 Paris, France.
authors.forename: D
authors.initials: D
authors.lastname: Delande
authors.affiliation: ESPCI ParisTech, PSL Research University, CNRS, Institut Langevin, 1 rue Jussieu, F-75005 Paris, France.
authors.forename: R
authors.initials: R
authors.lastname: Pierrat
authors.affiliation: School of Physical and Mathematical Sciences, Nanyang Technological University, 637371 Singapore, Singapore.|Centre for Quantum Technologies, National University of Singapore, 117543 Singapore, Singapore.|MajuLab, CNRS-University of Nice-NUS-NTU International Joint Research Unit UMI 3654, 117543 Singapore, Singapore.
authors.forename: D
authors.initials: D
authors.lastname: Wilkowski