Figure 3
From: Coherent Generation of Photo-Thermo-Acoustic Wave from Graphene Sheets
Effect of the laser pulse duration on the sound generation efficiency.
(a) The blue, black and red dots indicate the 130 fs, 190 ps and 230 ns laser pulses, respectively. For a large dynamical range the slope of the three are the same. (b) The frequency domain amplitudes and the time domain signals (inset, with offset) of the sound waves, produced with different pulses.
