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 field and electron density versus time in case (i)(blue line), case (ii)(green line), and case (iii)(red line).(a):Overall trend. (b)–(d): Zoomed portion of graph (a).