Fig. 1.

Spectral response of SLG under ultrafast excitation. a AS Raman spectra under ultrafast excitation for laser powers increasing along the arrow direction. The P_L-dependent background is fitted by thermal emission (Eq. 1, black lines) resulting in T_e in the 1700–3100K range. b T_e as a function of P_L. Error bars represent the 95% confidence bounds of the best fit. c Background subtracted, AS and S G peak (in black, normalized to the corresponding S maximum) measured as function of P_L in the range $~1.8÷7.0$ mW (corresponding to $T_{\mathrm{e}}~2000÷2700$K). Three representative P_L values are shown. Best fits of the G peak (blue line), obtained as a convolution of a Lorentzian (red line) with the IRF are also reported for the largest P_L value