Fig. 1: Multi-pulse setups for pump-probe spectroscopy and MDCS.
From: Multidimensional coherent spectroscopy of correlated lattice systems
a Two-pulse setup in a pump-probe experiment. The pump (blue) and probe (green) pulses are separated by a delay time T. b Four wave mixing realization of MDCS. Four non-collinear pulses with relative time delays τ, T and t form a box-geometry. In an optical measurement, the signal (red) is heterodyned with the last pulse (green). c MDCS setup with three collinear pulses (blue) and optical current measurement. An additional pump excitation (purple) at time tph before the three blue-shaded pulses can be added to photo-dope or drive the system into a nonequilibrium state. The signal (red) is collected by an electric measurement. d A twodimensional Fourier transformation converts the time delay (τ, t) into (ωτ, ωt). The signal intensities change as a function of the time delay T.
