Fig. 1. Schematic of fast-extending plasma-grating compression (FEPGC) amplification scheme.

Fig. 2. 10-μm infrared pulse (red), ionizing pulse (green), and reflected pulse (blue) at t = 33, 42, 51, and 60 ps. The gas density is 0.02 ± 0.01n_cr.

Fig. 3. Peak intensity and FWHM duration of reflected pulse with different simulation times. Solid lines: I₀ = 3 × 10¹³ W/cm² and Δ = 50%; dashed lines: I₀ = 2 × 10¹³ W/cm² and Δ = 50%; dotted lines: I₀ = 3 × 10¹³ W/cm² and Δ = 40%; dash-dotted lines: I₀ = 3 × 10¹³ W/cm² and Δ = 60%.

Fig. 4. Peak intensity and duration of reflected pulse at t = 60 ps with different grating periods.

Fig. 5. Spectrum of reflected pulse at t = 60 ps.

Fig. 6. Gas density and plasma density at (a) and (b) t = 13.33 ps and (c) and (d) t = 35.56 ps.

Fig. 7. I_y at (a) t = 45 ps and (b) t = 49 ps.