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Dicke subradiance in a large cloud of cold atoms | | William Guerin
; Araujo Michelle
; Robin Kaiser
; | | Date: |
1 Sep 2015 | | Abstract: | More than 60 years ago, Dicke published a seminal paper on coherence in
spontaneous radiation process by a collection of atoms. Superradiance has since
attracted a lot of interest, from its first experimental observation in a fully
inverted system in the 1970s to single photon superradiance in the 2000s.
Subradiance, on the contrary, has remained elusive, mainly because subradiant
states are weakly coupled to the environment and are very sensitive to non
radiative decoherence processes. They are thus much harder to populate and to
observe. Avoiding decoherence effects by using a dilute cloud of laser-cooled
atoms containing a large number of atoms, we report on direct observation of
subradiance. In our experiment, we use a far detuned laser to avoid multiple
scattering and detect the temporal decay after a sudden switch-off of the laser
beam. After the fast decay of most of the fluorescence, we observe a very slow
decay, with time constants as long as 100 times the natural lifetime of the
excited state of individual atoms. This subradiant time constant scales
linearly with the cooperativity parameter, corresponding to the on-resonance
optical thickness of the sample, and is independent of the laser detuning, as
expected from a coupled-dipole model. | | Source: | arXiv, 1509.0227 | | Services: | Forum | Review | PDF | Favorites | |
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