Influence of cutting off position of plasma filament formed by two-color femtosecond laser on terahertz generation

Xue Zhan-Qiang¹, Shang Li-Ping^{1, 2, †}, Deng Hu¹, Zhang Qian-Cheng¹, Liu Quan-Cheng¹, Qu Wei-Wei¹, Li Zhan-Feng³, Wang Shun-Li¹

(color online) THz wave amplitude and peak frequency for two repetitions at different terminated positions. (a) The THz amplitude and peak frequency are measured from the filament plasma formed by a lens with focal length 400 mm, (b) the lens focal length 1000 mm.