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Conference on Lasers and Electro-Optics

Three-pulse photon echo peak shift measurements in dense potassium vapor

Virginia O. Lorenz, Steven T. Cundiff

Published Jan 1, 2006• 0 citations
Publisher

Abstract

Three-pulse photon echo peak shift measurements in dense potassium vapor reveal an exponential peak shift, justifying an exponential two-time correlation function of frequency fluctuations, which is commonly assumed for more complex condensed phase systems.
DOI
10.1109/cleo.2006.4628592

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The three-pulse photon echo technique has provided significant insight into ultrafast dynamics in a variety of condensed phase systems1. Clear signatures of non-Markovian dynamics in a dense potassium vapor2 provide the opportunity to gain further insight into the correlation function of frequency fluctuations both experimentally and theoretically. Here, experimental three-pulse photon echo peak shifts are compared to calculated peak shifts that include the long-range resonant interactions in a dense atomic vapor within an exciton formalism3. A slow exponential decay in the peak shifts is attributed to long-range resonant interactions.
Transient four-wave mixing experiments with 100 fs pulses in a dense potassium vapor probe the electronic energy fluctuations that lead to optical decoherence. Echo-peak shift experiments yield a biexponential two-time correlation function of energy level fluctuations. Molecular dynamics simulations show that the slow component is a many-body excitonic contribution arising from long-range resonant interactions. The decay of the correlation function occurs on comparable time scales in theory and experiment.