Cooperative Emission of a Coherent Superflash of Light
arXiv:1405.5413 · doi:10.1103/PhysRevLett.113.223601
Abstract
We investigate the transient coherent transmission of light through an optically thick cold stron-tium gas. We observe a coherent superflash just after an abrupt probe extinction, with peak intensity more than three times the incident one. We show that this coherent superflash is a direct signature of the cooperative forward emission of the atoms. By engineering fast transient phenomena on the incident field, we give a clear and simple picture of the physical mechanisms at play.
4 Fig., 5 pages
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