Abstract
The diagrammatic theory of Friedberg and Hartmann, which solves the stochastically driven Optical Bloch Equation, is used to model the interaction of intense incoherent light and matter. Previous calculations obtained from the Friedberg-Hartmann theory to predict the results of intense incoherent two-pulse echoes experiments showed good qualitative agreement with the data, but indicated an anomalous decay of the echo signal in the high intensity regime. The decay was thought to arise from approximations used in the theory. Here, efforts have been made to extend the predictions from this theory to include nonzero correlation times, correlated pulses and the hyperfine structure of sodium. Improved predictions from this theory are then compared with data obtained from three- pulse photon echo experiments. Three-pulse echo experiments offer the advantage of an enhanced signal to noise ratio. In these experiments the dependence of the echo signal on the intensity of the constituent excitation pulses is studied. The results of these investigations indicate that the three- pulse photon echo data shows better agreement with the theoretical predictions than the two-pulse data when the finite atomic lifetimes are included. But, the same high intensity decay observed in the two-pulse echo data is still present, although to a lesser degree.
© 1994 Optical Society of America
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