Fig. 1. Variation of terahertz energy generated by two-color laser field with two-color laser wavelength

Fig. 2. Laser electric field E and electron density Ne, accumulation trend of transient photocurrent J along the filament, transient photocurrent at the maximum,spatial distribution of far-field energy of terahertz radiation generated when laser field is changed

Fig. 3. The change of terahertz energy with the relative phase of two-color laser field

Fig. 4. laser electric field E and electron density Ne, accumulation trend of transient photocurrent J along the filament, transient photocurrent at the maximum,spatial distribution of far-field energy of terahertz radiation generated when θ₂ is changed