Collective Atom–Light Interactions in Dense Atomic Vapours by James Keaveney

By James Keaveney

The propagation of sunshine in 'dense media' the place dipole-dipole interactions play a task is a primary subject that used to be first studied within the paintings of Clausius, Mossotti, Lorenz and Lorentz within the latter half the 19th century. despite the fact that, until eventually lately there remained a few parts of controversy: for instance, while the Lorentz version for a fuel predicts a resonance shift, a discrete dipole version doesn't. This thesis makes the 1st mixed size of either the Lorentz shift and the linked collective Lamb shift. This transparent experimental outcome prompted new theoretical paintings that has considerably complicated our knowing of sunshine propagation in interacting media.

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It is therefore somewhat surprising that the model still matches the experimental spectra as well as it does. For small thicknesses, accurate determination of the line shift and width is difficult due to the low signal-to-noise, limited by the overall amount of absorption. An improvement to the current experiment which is relatively easy to implement is to detect the off-axis fluorescence as the laser is tuned across the resonance. By using a single-photon counting module, we can detect very small fluorescence intensity, so the probe beam can remain weak.

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