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Schematic of the experimental setup. Pump pulses with 170 meV (41 THz) photon energy (close to resonance with the illustrated phonon mode) were generated by means of white light generation (WLG), followed by optical parametric amplification (OPA) and subsequent difference frequency generation (DFG) of the signal and idler beams. These pulses were stretched to a duration of Δτpump≈ 1 ps by propagation in a highly dispersive CaF 2 rod. The photo-induced changes in the far-infrared optical properties of K 3 C 60 were detected with phase-sensitive transient terahertz (THz) time-domain spectroscopy.

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