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Optics Communications

Dispersion of coherence spikes of incoherent broadband dye lasers

Anderson S. L. Gomes, L. H. Acioli, Cid Bartolomeu de Araujo, J. R. Rios Leite

Published Nov 1, 1989• 6 citations
Publisher
DOI
10.1016/0030-4018(89)90465-3

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The coherent propagation phenomenon of incoherent light through a resonant medium was experimentally demonstrated in the subpicosecond time region, using Na atoms and the light from an imperfectly mode-locked cw dye laser. The coherence spike with a 0.35-psec width in the cross-correlation profile between the propagated incoherent light and the initial light develops the same specific oscillatory structure as seen in the propagation of a weak coherent subpicosecond pulse. A theoretical analysis was also performed, and the experimental results are in considerably good agreement with the calculated ones.
Time-delayed four-wave mixing using incoherent light has been proposed as a new method to measure the ultrafast population relaxation time T1. Assuming three input beams of incoherent light with much longer duration than T1, the theoretical calculation has shown that the decay curve by T1 appears in the signal profile and that the time resolution is determined by the correlation time of the light. The decay time to be observed is twice that of the transient four-wave mixing with short pulses. We have experimentally confirmed the prediction by observing picosecond population relaxations of organic dye solutions, using nanosecond pulses from a normal broadband dye laser. An advantage of the present method over the pump-probe method using incoherent light is also discussed.