Figure 2

(a) Time dependence of the amplitude of the 1.8 THz peak showing the structure of the oscillations. (b) Time dependence–exponential decay of the oscillation amplitude depth at three different fluences.
(a) Time dependence of the amplitude of the 1.8 THz peak showing the structure of the oscillations. (b) Time dependence–exponential decay of the oscillation amplitude depth at three different fluences.