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. Author manuscript; available in PMC: 2015 Oct 9.
Published in final edited form as: Nature. 2015 Apr 9;520(7546):205–208. doi: 10.1038/nature14341

Figure 3. Time evolution of the FWM signal.

Figure 3

a, black circles connected by lines are the time dependence of the FWM signal, scaled to the intensity of the input beams (error bars are estimated as one standard deviation of the set of CCD images corresponding to the same Δt value); the blue and red lines are Rcc and the expected signal modulation due to acoustic modes, respectively. b, black circles connected by lines is the FWM signal after Rcc is subtracted. The red line is the modulation due to oscillations at frequencies ν1=1.15 THz and ν2=4.1 THz.