Fig. 1. Ultrafast group-velocity control mechanism via amplitude-to-frequency transfer in cascaded OPA

Fig. 2. Group-velocity-control simulations for the signal from a sawtooth-pulse-pumped cascaded OPA

Fig. 3. Dependence of fractional delay and fidelity on different input parameters of cascaded OPA

Fig. 4. Effect of dispersion on group velocity control under different wave-vector mismatch

Fig. 5. Group velocity control for a 30-fs pulse

Fig. 6. Group-velocity-control simulations for the signal from a Gaussian-pulse-pumped cascaded OPA