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Updated: Jul 7, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
Published on: June 28, 2016
Ultrafast optical spectroscopy of spectral fluctuations in a dense atomic vapor
V O Lorenz1, S Mukamel, W Zhuang
1JILA, University of Colorado, Boulder, CO 80309-0440, USA.
Abstract:
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.
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