Ultrafast Science / 2022 / Article / Fig 3

Research Article

Anti-Correlated Plasma and THz Pulse Generation during Two-Color Laser Filamentation in Air

Figure 3

(a)–(d) Shadowgraphs recorded by a CMOS camera: (a)-(c) time-resolved shadowgraphs of femtosecond laser filament when is fixed at 400 fs and varies from 0 to 5000 fs; (d) and are set at 0 fs and 5000 fs, respectively. (e) Longitudinal distribution of on-axis free electron density of filament as a function of when was calculated from Equation (1); dashed line corresponds to .