Figure 4:
Polarization-dependent pump-probe results. (a) Differential transmittance signal as a function of time delay for different polarization angles of pump laser at 0°–90° with polarization angle of probe laser at 0°. (b, c) Relaxation time τ 1 and τ 2 for photo-induced absorption. (d) Differential transmittance signal as a function of time delay measured for different polarization angles of pump laser at 0°–90° with polarization angle of probe laser at 90°. (e, f) Relaxation time τ 1 and τ 2 for band-filling effect. (g) The normalized ΔT/T 0 as a function of time delay from (a) and (d). (h) Peak signal |ΔT/T 0|max in (a). (i) Peak signal |ΔT/T 0|max in (d).