Fig. 4: IR nonlinear propagation.
From: Isolated attosecond pulse generation in a semi-infinite gas cell driven by time-gated phase matching
a IR spectra and (b) corresponding on-axis electric field obtained at the SIGC output with the nonlinear propagation code (utilizing the experimental parameters as input) as a function of the gas pressure in the first chamber. c–f Simulated nonlinear reshaping of the driving field as it propagates along the z-direction in the final portion of the cell around the geometrical focus: (c) on-axis peak intensity, (d) beam radius, (e) on-axis ionized electron density and (f) pulse energy during propagation under different pressure conditions
