Fig. 1. (a) Schematic diagram of experimental setup based on a Mach–Zehnder-like apparatus. M, mirror; BS, beam splitter; HRF, horizontal retroreflector; VRF, vertical retroreflector. (b) Spatial light intensity distributions of fs pulse. (c) Spatial light intensity distributions of temporally shaped ps pulse. The scale bar is 3 mm. (d) Schematic diagram of temporal delays between two sub-pulses.

Fig. 2. Induced ripple areas over the delay times. The markers in two curves correspond to different color blocks for the SEM insets.

Fig. 3. (a) Maximum electron density at different radial positions and delay times. (b) The electron density distributions corresponding to τ = ±1 ps, respectively. (c) The area center electron density over delay times. (d) Dependence of LSFL area on delay time. The insert shows an SEM picture of the LSFL covered area. The scale bar is 5 µm.

Fig. 4. Schematic diagram of electron excitation and energy absorption during irradiation of different FPDPSs. (a) The fs pulse arrives first. (b) The ps pulse arrives first.