Theoretical investigation on generating terahertz radiation from gas plasma induced by three-color ultrashort lasers
Wang Cheng-Lianga), Yang Zhen-Gangb), Liu Jin-Songa), Wang Sheng-Lieb), Wang Ke-Jia†a)
       
Laser electric fields versus time in one cycle of case (iv) (blue line), case (v) (green line), and case (vi) (red line).