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- W2050671434 abstract "We investigate radiation trapping in an atomic vapor which has been excited by a strong short laser pulse. Since the saturation of the vapor by the pulse leads to a decrease in the effective absorption coefficient, the radiation trapping becomes nonlinear. We derive approximate analytical expressions for the excited-state density in the directly excited region, the fluorescence-excited region, and the density averaged over the whole cell. Starting out from fairly simple approximate expressions based on a prescribed distribution of excited atoms, we then develop physically motivated correction factors that drastically improve the accuracy. All these expressions are given for three important cell geometries: the plane-parallel slab, the infinite cylinder, and the sphere. We compare our results to accurate numerical solutions, and find agreement within 5char21{}10%. We then derive the decay time of the emergent radiation, and find that it can be smaller than the natural lifetime of the excited atoms, in agreement with recent experimental results obtained for sodium vapors." @default.
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- W2050671434 date "1997-03-01" @default.
- W2050671434 modified "2023-09-27" @default.
- W2050671434 title "Nonlinear radiation trapping in an atomic vapor excited by a strong laser pulse" @default.
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- W2050671434 doi "https://doi.org/10.1103/physreve.55.3333" @default.
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