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Coherence Properties of Optical Fields: Weakly and Strongly Coherent Fields

B. Picinbono

Published Jan 1, 1967• 1 citation
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The output amplitude noises of one squeezed probe light which is at resonance throughout different optical depths media in strong- and weak-coupling-field regimes are investigated theoretically. By comparing the output quantum noises for different Rabi frequencies of coupling field and also for different optical depths, it is found that the optimal squeezing preservation of the probe light occurs in an optically thin medium with strong-coupling-field, where we can obtain the output squeezing close to the input one at nonzero detection frequency.
The squeezing properties of a light-atom interacting system are studied by means of quantum theory. In the system, two two-level atoms are initially in an entangled state, and the coherent optical field in a Kerr medium is in a coherent state. Influence of the coupling constant ga of dipole-dipole interaction between atoms and the coupling strength x of the Kerr medium with the optical field on the double atoms dipole squeezing and optical field squeezing are discussed by numerical calculations. It is found that under weak optical field condition, large ga and x weaken the atomic dipole squeezing; and under strong optical field condition, large ga increases the optical field squeezing events while large x reduces the frequency.
Dispersion and absorption properties of a weak probe field in a three-level V-type atomic system is studied. By application of indirect incoherent pump fields the effect of populating upper levels on optical properties of the atomic medium in presence of a strong coherent pump field is investigated. It is shown that the slope of dispersion changes from positive to negative just by changing the intensity of the coherent or indirect incoherent pump fields. It is demonstrated that the absorption-free subluminal and superluminal light propagation appears in this system.