Fig. 3: Theoretical modeling.
From: The emergence of macroscopic currents in photoconductive sampling of optical fields
a Electron mean-free path lmfp at 1 mbar for argon (blue line) and nitrogen (red lines) as a function of kinetic energy. b Evolution of the ionization fraction (red line) and electrostatic potential (blue line) of the ion background toward the electrode for 1 mbar argon. Simulation parameters: beam waist ω0 = 25 μm and intensity I = 1.2 ⋅ 1014 W cm−2.
