We present a theoretical analysis of the intensity correlations between the spectral components of the resonance fluorescence triplet while allowing for detection time differences that are smaller than the inverse frequency width of the frequency filter. Explicit expressions are derived for the intensity correlation functions that are valid for all times. Furthermore, we present the results of measurements on these correlation functions for the 'So~'P& resonance transition of natural barium. In general, the results confirm the theoretical predictions.

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We report the observation of "tunneling" eKects in a classical optical two-level system. In particular, we present experimental results for the optical implementations of the Landau-Zener Inodel and. of a hidden level-crossing model. The experimental results are in good agreement with theory for both the transition probability and the detailed time evolution of the wave function.PACS number(s): 32.80.Bx, 33.80.Be

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