title: Fourier algorithm for four-wave-mixing signals from optically dense systems with memory.
abstract: A triple Fourier-transform algorithm for generating and propagating femtosecond four-wave-mixing signals in optically thick samples is demonstrated. The algorithm has a dynamic range that is useful for tests of theory and simulations of experiments with an arbitrary nonlinear response. Although two-pulse echoes decay faster as optical density increases for a Bloch model, we find that systems with memory exhibit the opposite trend.
authors.affiliation: Department of Chemistry and Biochemistry, University of Colorado, Boulder, Colorado 80309-0215, USA. nadia.belabas@polytechnique.org
authors.forename: Nadia
authors.initials: N
authors.lastname: Belabas
authors.forename: David M
authors.initials: DM
authors.lastname: Jonas