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Optics Communications

Interference between the resonance fluorescence fields from two independent atoms and spatial two-photon correlations

Th. Richter

Published Jan 1, 1991• 16 citations
Publisher
DOI
10.1016/0030-4018(91)90266-g

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We examine the intensity correlation functions of the two fluorescent fields that are emitted from the top and middle states of a doubly driven three-level atom in the cascade configuration. Novel interference effects are shown. (i) Both of the fluorescent fields have anticorrelations which can exist for long times when the applied fields are on the two-photon resonance and far off one-photon resonances. (ii) Both of the fluorescent fields have strong correlations when the applied fields are far off one- and two-photon resonances. In particular, the extremely strong correlation occurs for the photons emitted from the top state. The above phenomena are traced to the multiple interference mechanisms.
The joint probability P 12 of detecting two photons at two different positions in the interference of a classical field with the resonance fluorescence field from a coherently driven two-level atom is investigated. We find that P 12 shows a stronger modulation with detector separation than is predicted by a classical wave theory. Under stationary conditions and if the driving field is strong enough to saturate the atomic transition, the relative modulation amplitude a of the P 12 pattern reaches its maximum possible value a = 1 for E → 0 (where E is the classical field amplitude), but simultaneously the whole phenomena vanishes, P 12 → 0. For equal intensities of the classical and the resonance fluorescent field we have a = ⅔. Compared with this, a classical wave theory predicts a possible maximum value of a = ½.