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Topics in Coherent Atom-Field Interactions: I. Transverse Effects in Linear Pulse Propagation. I. Initiation of Superfluorescence in a Large Spherical Sample.

Sudmakar Prasad

Published Jan 1, 1983• 0 citations
OpenAlex

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Experiments on the Initiation and Coherence Properties of Superfluorescence (With 5 Figures)

Quirin H. F. Vrehen

•Jan 1, 1979•0 citations
We report the first direct measurement of the effective initial tipping angle ${\ensuremath{\theta}}_{0}$ in superfluorescence. A coherent pulse of small area $\ensuremath{\theta}$, resonant on the superfluorescence transition, is injected into a completely inverted sample of cesium atoms and the delay of the out-put pulse is measured as a function of $\ensuremath{\theta}$. The value of ${\ensuremath{\theta}}_{0}$ obtained agrees in essence with 2(N)12\frac{2}{{(N)}^{\frac{1}{2}}}(N)21​2​. The latter value is predicted by recent theories which consider the quantum initiation of superfluorescence and which take propagation effects into account.
A model is presented for the dynamical evolution of superfluorescence from an optically pumped three-level system. The full propagation, transverse, and diffraction effects are taken into account. With the use of a previously developed algorithm, a computational simulation was constructed from this model and results are presented and discussed. In particular, it is shown that the injected coherent pump-pulse initial characteristics, such as on-axis area, temporal and radial width and shape, can have significant deterministic effects on the superfluorescent pulse delay time, peak intensity, temporal width, and shape. Thus, by specifying certain initial properties of the injected pump pulse, the superfluorescent pulse can be shaped and altered. The results predict the conditions under which an injected light pulse of a given frequency can be used to generate, shape, and control a second light pulse of a different frequency via a nonlinear medium, thus demonstrating a new aspect of the phenomenon of light control by light.