Fig. 4: Excitation-fluence-dependent measurements and simulations.
From: Quenched lattice fluctuations in optically driven SrTiO3
a, Time-resolved changes in the R-point X-ray diffuse scattering intensity for a mid-IR excitation fluence of 60 mJ cm−2. b, Simulated normalized changes in the variance in the AFD R-point mode amplitude \(\left\langle {u}_{\rm{AFD}}^{2}\left[t\right]\right\rangle\) for the same excitation fluence using the full model presented in equations (1)–(3). The isolated contributions arising from the nonlinear coupling of this mode to the infrared-active phonon QIR (magenta) and strain Qη (orange) are also shown. c, Same measured quantity as in a for an excitation fluence of 35 mJ cm−2. d, Same simulated quantity as in b for an excitation fluence of 35 mJ cm−2. e, Same measured quantity as in a,c for an excitation fluence of 15 mJ cm−2. f, Same simulated quantity as in b,d for an excitation fluence of 15 mJ cm−2.
